If you're interested in checking out the "jam band" phenomenon, may I say that you could hardly do better than to check out Jupiter Coyote: Live?
It's a fabulous mix of rock'n'roll, bluegrass, and jazz, in the style of groups like the Marshall Tucker Band. I got ahold of this little treasure a couple of days ago and I like the first disc (it's a two-disc set) I haven't even gotten around to listening to the second one yet. The first alone is worth the price of admission, and I think the laser in my CD player may already be burning a hole in the disc.
Oh yeah, and check out the Jupiter Coyote web site. There are some free MP3s that you can download from there. Although the live stuff is cooler.