MeatballWiki
A new book from O'Reilly by Christian Crumlish and Erin Malone on how industry leaders design effective social interfaces. The associated [wiki] is also fascinating.
Conversation
FridemarPache: Thank you Sunir, such a book is especially interesting, as it is accompanied by a wiki to connect community development with software development. For community oriented designers and programmers, it might also be interesting to connect that with http://www.ShiftSpace.org a userprogrammable layer all over the Web, which itself is based on the browser addon Google:GreaseMonkey.