I really like how the forum of TGP (thegearpage.net) works and related to that also the one from Fractal Audio Systems (forum.fractalaudio.com):

– Good search capabilities (full forum, forum specific, title only etc.etc.)

– More control over subscriptions to threads

– Good support for media and links to (YouTube) videos/audio

– Private messaging

– Seems to me like this is standard forum based software?