Microsoft’s documentation team has given you (those registered with MSDN online) the ability to add your own content to MSDN.
Here is your chance to tell the world of your knowledge in a bigger venue than a place like blogs (that most likely are not as frequented as much as MSDN).
Some things to keep in mind:
MSDN Wiki Frequently Asked Questions
Contribution Agreement
An example is here:
http://msdn2.microsoft.com/en-us/library/aa560332(VS.10).aspx