The Springboard content series on TechNet has a blog. AFAIK this is the first time a content series has started a blog, as opposed to a product group. Check it out and keep an eye on it around the PDC timeframe for announcements and information about planning and deploying Windows 7.

Here's looking forward to an "Exchange Administrator's Guide blog", or a "Windows Server 2008 ResKit blog" or, (my favorite) a "PowerShell Command Line Reference blog".