I own a Canon Digital Rebel and have brought it underwater. I no longer have that housing though. I used to own a Canon Elan II and brought that underwater also. Great cameras and always had good luck
I personally have a Canon A640 10meg camera. It's not top of the line, but I wasn't looking for top of the line as I have my SLR digital and film cameras.
I picked my camera up at Butterfly Camera and the housing at Adorama Camera. As I said, only cost about $410 for everything and it worked great! It was so much easier to lug around than my SLR with large underwater housing that was a suitcase in itself. This little underwater case fit right into a small camera case with the camera and other accessories.