Canon EOS 1000D "Video Mode"
It is available for Mac and PC. It supports the Canon EOS 450D, Canon EOS 1000D, Canon 40D, Canon 50D, Canon 5D Mark II and Canon 1Ds Mark III. All you do is plug in the camera via USB, and then press the record button in the software. While the video it records is not full HD (it varies for each camera), it is more than SD, and records it .AVI files. Hope this helps some of you get the most out of your "older" cameras.
NOTE: Since the camera doesn't have a microphone, it (obviously) won't record audio with the video.