I'm happy to report that the excellent MSDN Wiki is now available for the Windows SDK docs. MSDN Wiki is the brainchild of the brilliant and beautiful Molly Bostic. Mad props to Molly.
To participate, just find the Community Content section at the bottom of a topic, and click "Add new Community Content". Okay, you'll have to sign up before you can post.
Of particular interest to readers of this blog is the WPF portal.
Have fun weaving together the community ecosystem.