I had a chance to catch them over the weekend, and it will definitely go down as one of the better shows I see this year. They've got incredible dual percussion, cool guitar/keyboard effects, the whole stage draped in trippy lighting, and just all-around impressive musicianship. The regular drummer of the band broke his wrist mid-tour, but stand-in Ahmed Gallab was absolutely top notch.
The crowd was so enthusiastic that random bursts of applause would break out right in the middle of a song, or after a round of furious drum work, and you could tell that the guys on stage were just eating it up. They only have a handful of U.S. dates left on their tour (Missouri, Indiana, Ohio, New York) but from what I've read they are pretty much always on the road, so keep an eye on them. I know I'd gladly pay to see them again whenever I have the opportunity, and I think these guys would be a really cool attraction for a big festival like ACL with some full-on production.
For another perspective on the live show, here's a link to a recent review of their tour. Here's another one. Check out the myspace page to see tour dates, and listen to Andorra if you haven't already.
Here's a couple of older ones from Caribou:The Milk Of Human Kindness, and "Hendrix With Ko" is from Up In Flames. Both albums are solid in their own right. They have a different feel than Andorra, but it's a good thing. You can get 'em both right here, where you can also preview/purchase all the Caribou you like.