Any webcam that is UVC (USB Video Compliant) should work. You will need to be using at least OS 10.4.9. Personally I use a Logitech, QuickCam Deluxe for Notebooks, and it works fine. But be carefully, older versions of the Deluxe model do not support UVC. Look for a model that is VISTA compliant, that should also be UVC compiant. You may want to pick up a copy of iGlasses, the software will give you a lot of control over the webcam image.