I think the Independent is one of the best places to see live shows in SF. I love the place, but then again I'm over 21. It's on Divis near lower Haight or so, the 'hood can be a bit sketchy at times but I haven't had any problems there.

If BA is looking for great local SF venues that are all ages, they should check out Slim's and/or Great American Music Hall. I think the contact info on this link is a bit out of date....

http://www.playinginfog.com/links/sfclubs.html