MSDN recently added Wiki functionality to the portion of the site dealing with Visual Studio 2005 and .NET Framework 2.0. This already looks like it is going to be a great resource - at the time of this post, there were almost 1000 topics with Community Content from over 300 contributors. You can read more about it at MSDN Community Content FAQ.
Here's a sample screenshot of a community content block on an MSDN library page (click the image to see a full size version).
Hope this helps.