Ok, here's a few ideas up for discussion. You've gotta have the "Music News" type thing. I get alot of emails updating me on what's going on in the music industry. It's nice to know who's coming out wiht a new album and such.
You're already started the hot new song thread, and there are a few others out there, so those are starts, and with proper bumpage, they could be more active I'm sure.
Fun threads can be there too. I remember going thru one of those dumb myspace surveys that you use your iPod (or other respective mipp3 player) on shuffle and answer the questions based on the next song up. It's stupid but can be funny.
Personal pictures from concerts. I take quite a few, and others do too.
Funny concert stories.
Local band promotions...etc.
There are a few ideas.