Head to apple.com and look at the models noted there.
But most firewire cameras just work. If you attempt USB, it's like swimming with a cement overcoat.
We are looking to buy a video camera for our 15 year old son. He mostly videos and makes movies of his freestyle skiing and skateboarding but also makes movies for school assignments. For his skiing video a good zoom is important as well as steady shot as the video tapers are often moving. He uses a Mac Powerbook G4 and i-movie. We are upgrading him to i-Life Suite 5. He enjoys using many of the editing features in his movie making. Can you recommend a few camcorders that would work?