MSN Web Communities: Basketball
   Microsoft basketball community and club listings.
   http://groups.msn.com/browse.msnw?catid=319

Yahoo! Groups: Basketball
   Directory of Yahoo! Basketball clubs and communities.
   http://dir.groups.yahoo.com/dir/Recreation___Sports/Sports/Basketball

Yahoo! Groups: NBA Zone 2K
   A major sports club in Yahoo! Groups.
   http://groups.yahoo.com/group/nbazone2k/