As Rob Howard talks about on his blog there are 2 great books on Community Server coming soon the first one is more of a getting started book for new comers written by Anand Narayanaswamy called Community Server Quickly

The second one is more technical and geared towards development and is written by Telligents own Wyatt Preul and is called Professional Community Server  I can't wait to get my copies of both and check them out!