Boys, boys, boys.......If you want an open forum (kind of), there is always the "rec.autos.makers.ford.mustang" news group. If your looking for a Shelby/Mustang specific forum:
http://forums.vintage-mustang.com/forums/wwwthreads.pl
http://www.metromustang.com/classic/wwwboard.htm
But then again, what would I know
.
Bill S.
PS: For a huge list of Mustang and Shelby related sites, see the following url as well:
http://links.vintage-mustang.com/nomusic.html