He designed Blogger.com (which I recently praised) and he puts vanilla ice cream in his coffee (every day). Derek Powazek is working on a book about designing websites for community called (brilliantly) Design for Community: The art of connecting real people in virtual places.
There are percilations of potential community-type features right here on aov. Do you have anything interesting to say, all you readers of aov?
In the mean time, read the preface to Powazek's book.