These just work: Find Apple Mac specific models of driverless web cams that Just Work on Apple OS X 10.4 Tiger and 10.5 Leopard. http://www.uvccompatiblewebcams.com lists known working video web chat USB webcams that use the new UVC - Universal USB 2.0 Video Class standard.
UVC compliant webcams need no Mac-specific drivers (and work with Windows Vista with its UVC native support as well). Just plug 'em in and use with the most popular Macintosh video chat applications like iChat, Yahoo Messenger Mac, ISPQ, Skype and more. The website features a short, reviewed list of known-working Apple compatible webcams from Creative Labs, Logitech, eCamm, MacAlly and Microsoft - as well as additional insights and info on using your Mac for videoconferencing, security and remote monitoring.

Visit: www.uvccompatiblewebcams.com