I just went and looked at the lineup. I would probably spend my entire time going to the small stages if I went. For those going, let me recommend a few smaller acts:
1.
The Yard Dog Road Show: I saw these guys a long time ago at some weird festival in Arkansas. I cannot stress enough how much you should go see this show. Checking out their website, it looks like they've only impoved the act since I saw them. Seriously, if you've never see it, check it out. It might be the most interesting thing you see all weekend.
2.
Shooter Jennings. He had a cameo in Walk the Line, playing his dad. He's cool and worth catching.
3.
Lucero. They're awesome. Of course, they play around here quite a bit, too, so might not want to 'waste' your time checking them out at a huge festival.
4.
Eckobase: They're playing on the homegrown stage. These are some local boys, some of whom are good friends. Go check 'em out if you get a chance.
Finally, I'd go just to see the Lips.