DP is my main forum and the best of course.
AA is second, most people know their stuff, some silly Germans frequenting the site, but you learn to ignore them.
Third:
http://www.cdinteractive.co.uk/forum...2d2faab4bf90d2
for my CDi fix
Stay away from the British Retro Gamer forum, whilst the magazine is usually very good indeed, the forum is overun by Idiots who don't know anything about video gaming, and 99% only post rubbish beyond believe.