There are many bodybuilding forums on the inter webs. I would believe the most obvious one is forum.bodybuildingdotcom. This forum seems to have just about everything bodybuilding on it.
Basically, forums target a specific niche. There cannot be one best forum. There are many out there.It actually depends on what you are looking for. Basically, forums target a specific niche.
If you mean Browsers FireFox is fast and stable, along with Opera and Chrome. IE8 is ok also, my reccomendation is firefox because of it's huge ammounts of plugins, addons, fast speed, security and...