While preparing for an upcoming VDI project I went through my archives and inventoried some trusted blogs for architecture, scale, and implementation guidance for the Microsoft + Citrix VDI solution which consists of Hyper-V, VMM, and APP-V from Microsoft and the XenDesktop suite from Citrix. A year or so ago, I created a VDI module for Microsoft’s Server Virtualization with Advanced Management (SVAM) offering using these technologies so I wanted to see if anything had changed with the newer versions of each product. Below is a list of very good resources on this topic. Note that some of these may require registration or a My Citrix login which can be requested by signing up at citrix.com. Also note, most of these sources are non-Microsoft so you should verify supportability, functionality, and applicability to your specific environment.
XD Design Handbook
Link
XenDesktop Modular Reference Architecture
Best Practices for Scaling Virtual Desktops (webinar)
TechTalk: Hyper-V Planning for XenDesktop (webinar)
RD Virtualization Host Capacity Planning in Windows Server 2008 R2
Windows 7 Registry Optimizations for Virtual Desktops
XenDesktop on Microsoft Website
Blog Series on VDI storage with NetApp
Advanced Memory and Storage Considerations for Provisioning Services