I can not take credit for pulling this together, however, copy and paste can be a blogs best and worst tool. All of the information is publicly available. In summary, links to blogs of the various Microsoft product teams that will provide you insights, guidance, tricks, tips, and opinions about using Microsoft technologies and software.

For more community and individual blogs check out: http://www.microsoft.com/communities/blogs/

Security
Systems
Management
Products
Server/
Infrastructure
Products
Desktop/Mobile
Products
SQL Server
Collaboration,
Content and
Records
Management
Microsoft Office
System
Business Process
Management
Web/
Development
Dynamics