About a month ago Microsoft launched two Forums aimed at architects on the MSDN forums

   Architecture Forums: General Forum and Architecture Forums: Modeling and Tools

Here is the introduction as posted by Simon Guest :

"Welcome to the Architecture General Forum. This forum is for discussing general issues and experiences related to architecture and designing solutions on the Microsoft platform.  This forum is moderated by several members of Microsoft's Architecture Strategy Team.  We welcome all questions and comments related to architecture, although we recommend that product specific questions (for example, "I can't get x to install") are directed to more appropriate forums.  "