Well hammel, it depends what you want to do. Do you want it streamed, to watch while you record? Or do you just want to capture? iMove has a built-in video capturing feature which works awesomely, even for HD footage (from a camcorder, for example, over USB). Other products you can use include Pinnacle's video capture hardware for the mac (expensive, but works nice). Is this the kind of thing you had in mind?