Hi,
Found this thread after researching cameras to use with Photobooth on my G4 Powerbook (kids love it!) First I tried the Macally USB camera, and while it worked right out of the box, it didn't look very good. In fact the kids gave it a resounding thumbs down, loudly proclaiming that it looks cheap!
Well, we just can't stand for that, so I took back the Macally and bought one of the Creative Optia AF cameras. At first it didn't want to work, but I opened Quicktime Pro and enabled a "New Movie Recording" and it fired right up. After that, I opened Photo Booth (an early version I had downloaded from some link on this site), and I could get picture from the camera, but many of the special effects in Photobooth did not work. Some of the screen sizes seemed off as well.
Not really wanting to stand in another holiday return line, I decided to give it one more try with Leopard. So I upgraded the powerbook to Leopard 10.5.1, and everything seemed to work fine. Now, Leopard installed Photobooth 2.0, so that may have been the reason for the fix, but it does seem to work, and the picture quality of the Optia is tremendously better than the Macally. So for me, the Optia AF webcam does work with Leopard. It does not work with the macam driver however.
Bob