I often find myself describing to people at work (Microsoft) what developer centers we have on MSDN. I think its important to occasionally let people know that these exist and what's available for developers. The MSDN Developer Centers page descibes the key developer centers and their purpose:
Developer Centers are locations on MSDN that aggregate all the content and resources that you need to be successful around a particular product, technology, audience or geography. They provide a clear roadmap and a means to help you more directly in strategic areas.
I use this page to hit the various developer centers all the time. Many of the people in my Friends list on my blog page are Content Strategists for MSDN. I'm the Content Strategist for the Security and the Visual C++ Developer Centers.