Here are some other forums that I participate in that are full of good info on many things non- lefty bass related:
BadAssBassPlayers: http://www.badassbassplayers.com
The Last Bass Outpost: http://www.bassoutpost.com
Talkbass: http://www.talkbass.com
These are general discussion sites, but there are some great brand specific forums like Fender and Musicman out there too!