By no means the master list - but here is what I've found.
Deployment and Service Management
Solution Accelerator Assessment and Planning Website | RSS Feed
Desktop and Mobile
Microsoft Desktop Optimization Pack MDOP Website | RSS Feed
Windows 7 Website | RSS Feed
Windows 7 Engineering Website | RSS Feed
Windows Embedded Website | RSS Feed
Windows Embedded Point of Service for dotNET Website | RSS Feed
Windows Mobile Website | RSS Feed
Windows SideShow Website | RSS Feed
Ultra Mobile PC Project Origami Website | RSS Feed
Windows CE Base Website | RSS Feed
Windows Genuine Advantage Website | RSS Feed
Windows Vista Website | RSS Feed
Open Source News Feed Website | RSS Feed
Reference Source Code Website | RSS Feed
Development Shared Source Initiative
CodePlex Website | RSS Feed
Dynamics
Dynamics CRM Website | RSS Feed
Dynamics CRM Online Website | RSS Feed
Dynamics NAV Website | RSS Feed
General
MSDN Subscriptions Website | RSS Feed
TechNet Magazine Website | RSS Feed
TechNet Plus Subscriptions Website | RSS Feed
MSDN Magazine Website | RSS Feed
Support Lifecycle Website | RSS Feed
Industry Solutions
Chemical Website | RSS Feed
Health Website | RSS Feed
Power and Utilities Website | RSS Feed
Environment Software Enabled Earth Website | RSS Feed
Microsoft dot com Operations Website | RSS Feed
Working for Microsoft - JobsBlog Website | RSS Feed
XPS XML Paper Specification and Open Packaging Website | RSS Feed
Education UK Schools Website | RSS Feed
Education US Specialist Team Website | RSS Feed
Manufacturing and Resources Website | RSS Feed
MIX The Next Web Now Website | RSS Feed
Startup Zone Emerging Business Team Website | RSS Feed
Installation and Update Services
Microsoft Update Website | RSS Feed
Microsoft Deployment Toolkit Website | RSS Feed
Windows Server Update Services Support Website | RSS Feed
The Deployment Guys Website | RSS Feed
User State Migration Tool USMT Website | RSS Feed
Windows Installer MSI Website | RSS Feed
Windows Server Update Services Website | RSS Feed
Microsoft Advertising
adCenter Analytics Website | RSS Feed
adCenter API for Developers Website | RSS Feed
adCenter for Advertisers Website | RSS Feed
adCentre Labs Website | RSS Feed
Microsoft Conferences and Briefings
TechEd Website | RSS Feed
Professional Developers Conference PDC Website | RSS Feed
Microsoft Press Pass
Xbox Press Releases Website | RSS Feed
Press Pass Press Releases Website | RSS Feed
Press Pass Top Stories Website | RSS Feed
Misc (sites I can’t figure out where they go...)
Microsoft Surface Website | RSS Feed
Professional Photography Website | RSS Feed
Response Point Website | RSS Feed
Project Astoria Next Generation Data Programability Website | RSS Feed
Photosynth Website | RSS Feed
Popfly Website | RSS Feed
Networking and Remote Access
Microsoft Enterprise Networking Website | RSS Feed
Network Access Protection Website | RSS Feed
Routing and Remote Access Website | RSS Feed
Network Monitor Website | RSS Feed
Windows Core Networking Website | RSS Feed
Office Suite
Office Access Website | RSS Feed
Office Excel and Excel Services Website | RSS Feed
Office for Mac Website | RSS Feed
Office Outlook Website | RSS Feed
Office Natural Language Website | RSS Feed
Office InfoPath Website | RSS Feed
Office Outlook Mobile Website | RSS Feed
Office Powerpoint Website | RSS Feed
Office Project Website | RSS Feed
Office Sustained Engineering Website | RSS Feed
Office Visio Website | RSS Feed
Office Word Website | RSS Feed
Partner Resources
Microsoft on Independent Software Vendors ISVs Website | RSS Feed
Microsoft IT Showcase Website | RSS Feed
Microsoft Operations Framework Website | RSS Feed
Solution Accelerator Security and Compliance Website | RSS Feed
Product Support
Daylight Saving Time and Time Zone FAQs Website | RSS Feed
Hotfix Support The Hot Blog Website | RSS Feed
SysInternals Website | RSS Feed
Technical Rollup Mailings Website | RSS Feed
January 2009 - Technical Rollup Mail - Internet - 06-Jan-2009
January 2009 - Technical Rollup Mail - Manageabillity - 06-Jan-2009
January 2009 - Technical Rollup Mail - Platforms - 06-Jan-2009
January 2009 - Technical Rollup Mail - Security - 06-Jan-2009
January 2009 - Technical Rollup Mail - SQL Server - 06-Jan-2009
January 2009 - Technical Rollup Mail - Unified Communications - 06-Jan-2009
Research and Labs
Microsoft Live Labs Website | RSS Feed
Microsoft Research Downloads Website | RSS Feed
Microsoft Research News and Headlines Website | RSS Feed
Microsoft Research Publications Website | RSS Feed
Office Labs Website | RSS Feed
Security
Microsoft Malware Protection Center Website | RSS Feed
Microsoft Security Response Center MSRC Website | RSS Feed
Security Bulletins Comprehensive Website | RSS Feed
Bluehat Security Briefings Website | RSS Feed
Security Bulletins Advisories Website | RSS Feed
Security Vulnerability Research and Defense Website | RSS Feed
The Security Development Lifecycle Website | RSS Feed
Windows Vista Security Website | RSS Feed
Microsoft Application Threat Modelling Website | RSS Feed
Security Products Forefront
Forefront Intelligent Application Gateway IAG Website | RSS Feed
Forefront Server Security Website | RSS Feed
Forefront Threat Management Gateway ISA Server Website | RSS Feed
Microsoft Connected Information Security Group Website | RSS Feed
MSRC Ecosystem Strategy Website | RSS Feed
Forefront Client Security Website | RSS Feed
Forefront Product Suite Website | RSS Feed
Server and Infrastructure
Windows Home Server Website | RSS Feed
Active Directory Services Website | RSS Feed
Advanced Windows Debugging and Troubleshooting Website | RSS Feed
Commerce Server Website | RSS Feed
Essential Business Server Website | RSS Feed
Group Policy Website | RSS Feed
Server Core Ask the Core Team Website | RSS Feed
Small Business Server SBS Website | RSS Feed
Windows Powershell Website | RSS Feed
Windows Server Division Website | RSS Feed
Clustering and High Availability Website | RSS Feed
Platforms Performance Website | RSS Feed
Storage Website | RSS Feed
Windows Auditing and Security Logging Website | RSS Feed
Windows Server Performance Website | RSS Feed
DHCP Windows Enterprise Networking Group Website | RSS Feed
Windows Virtualization Website | RSS Feed
SharePoint Groove Search
SharePoint Products and Technologies Website | RSS Feed
Enterprise Content Management Website | RSS Feed
Enterprise Search Website | RSS Feed
Groove Website | RSS Feed
Groove Support Website | RSS Feed
SharePoint Designer Website | RSS Feed
SharePoint Developer Website | RSS Feed
SQL and Business Intelligence
BizTalk Adapter Pack Website | RSS Feed
BizTalk Server Website | RSS Feed
Office Performance Point Server Website | RSS Feed
SQL Performance Engineering Website | RSS Feed
SQL Programmability and API Website | RSS Feed
SQL Release Services Website | RSS Feed
SQL Server Compact Website | RSS Feed
SQL Server Development Customer Advisory Website | RSS Feed
SQL Server Engine Website | RSS Feed
SQL Server Express Website | RSS Feed
SQL Server Manageability Website | RSS Feed
SQL Server Protocols Website | RSS Feed
SQL Server Query Processing Website | RSS Feed
SQL Server Reporting Services Website | RSS Feed
SQL Server Security Website | RSS Feed
SQL Server User Education Website | RSS Feed
ProClarity Website | RSS Feed
Systems Management
System Center Online Website | RSS Feed
System Center Manageability Website | RSS Feed
System Center Website | RSS Feed
System Center Data Protection Manager DPM Website | RSS Feed
System Center Essentials Website | RSS Feed
System Center Mobile Device Manager Website | RSS Feed
System Center Operations Manager Website | RSS Feed
Unified Communications
Microsoft Exchange Website | RSS Feed
Live Meeting Service Developers Website | RSS Feed
Office Communications Server Website | RSS Feed
Office Communicator Website | RSS Feed
Speech Server Website | RSS Feed
Virtualization
SoftGrid Website | RSS Feed
Terminal Services Website | RSS Feed
Web and Development
RSS Web Feeds Website | RSS Feed
Expression Web Website | RSS Feed
Application Consulting and Engineering ACE Website | RSS Feed
Expression Blend and Design Website | RSS Feed
Internet Explorer Website | RSS Feed
JDBC Driver Website | RSS Feed
Patterns and Practices Website | RSS Feed
Visual Basic Website | RSS Feed
Visual Studio Extensibility Website | RSS Feed
Visual Web Developer Website | RSS Feed
Windows Presentation Foundation WPF SDK Website | RSS Feed
XNA Games Development Website | RSS Feed
The dotNET Endpoint Website | RSS Feed
Visual C++ Website | RSS Feed
Visual Studio Code Analysis Website | RSS Feed
Visual Studio Team Architect Website | RSS Feed
Web Deployment Website | RSS Feed
Windows SDK Website | RSS Feed
XML Website | RSS Feed
Jscript Website | RSS Feed
Mobile Developer Website | RSS Feed
ADO dotNET Website | RSS Feed
IIS and ASP dot NET Support Website | RSS Feed
Windows Azure Cloud Computing
Azure Live Services Website | RSS Feed
Azure Cloud Computing Tools Website | RSS Feed
Azure dotNET Services Website | RSS Feed
Azure SQL Data Services Website | RSS Feed
Windows Online
Microsoft Online Services Website | RSS Feed
Windows Live
Live Mesh Website | RSS Feed
Live Photo and Video Website | RSS Feed
Live QnA Website | RSS Feed
Live Search Website | RSS Feed
Live Writer Website | RSS Feed
Live Alerts Website | RSS Feed
Live ID and Identity Gateway Website | RSS Feed
Live Favorites Website | RSS Feed
Live Mail Hotmail Website | RSS Feed
Live Maps Virtual Earth Website | RSS Feed
Live Messenger Website | RSS Feed
Live OneCare Website | RSS Feed
Live Search Webmaster Center Website | RSS Feed
Live Sky Drive Website | RSS Feed
Live Spaces Website | RSS Feed
Office Live Workspaces Website | RSS Feed
