I went on Friday with about ten fellow Atheist Community members to see Jesus Camp, but I hadn't gotten around to posting my review until now. This has already been discussed on both The Non-Prophets and The Atheist Experience, but I'm offering up a written version for your perusal.
First of all, this is not a pleasant movie in most respects. What it is boils down to watching an hour and a half of child abuse, at least from my perspective. If you experience the sort of morbid fascination that comes from watching a bleak horror movie, you may get the same sort of feeling from this movie: you're not having fun while you watch it, but you may feel like you got something out of the experience of having watched it.