I wanted to get a web cam that would work with Mac OS X, without any additional drivers. Apple recommends using the iSight or other DV cameras for use with their video tools. I didn't want to buy a iSight, as I don't think it is worth the money.
The iMage webcam is USB web cam that works with Mac OS X, without any additional drivers. The quality is very good, and it works seamlessly with iChatAV, Skype and other web cam software.