Yahoo Groups now has a primarily geared hub oriented group forum. It actually is listed as for non deraillleur bikes but the activity since it started has been primarily oriented towards gear hubs, at least 95% I would estimate. Discussions have included everything from two speed fixed gear AW conversion methods to the 14 speed Rohloff gear hub. Still a relatively small group but always interested in new members, the more active the better.
Here is a link for those interested.
http://groups.yahoo.com/group/Geared_hub_bikes/