I really, really enjoyed The School of Rock, even though it could have been much better as a movie. It's just really fun to see kids who are really good musicians having a good time. I don't know if I'm quite sold yet on Jack Black, and I'm definitely not sold on Tenacious D. They're basically like Ween except less funny and less talented but with a lot more clout in Hollywood.
The movie was an excellent ROCK 'N' ROLL experience. I only have one complaint: if you're going to do "It's A Long Way To The Top", you must, must, must have bagpipes. They should have had a kid around for the whole movie who isn't a good actor and doesn't seem that good at anything but who suddenly appears with the mighty bagpipes during the closing credits and rocks out. This may not be an unforgivable oversight, but it is an obvious one. Shame on you, Jack Black!