Hi Peter! I guess it depends on what you find interesting. Here are a few sites you can go to to check out the scene and who's playing:

http://www.moshking.com/ <---------this one is for metal and hard rock
http://www.laweekly.com/ <--------this is great for its variety

http://www.casenet.com/music/music.html <------don't go to this one much, but...

or you can check out the clubs themselves:

www.hollywoodpalace.com
www.hob.com House of Blues
www.galaxytheatre.com
http://www.uniamp.com/ Universal Amphitheater
www.viperroom.com
www.goopytone.com The Roxy
www.thekeyclub.net
www.whiskyagogo.com

Have fun!
Rogue
http://RogueCreations.tripod.com/