If you own a Macintosh and your Mac is USB-ready you will need to go with the Logitech QuickCam Pro. While Logitech does not always receive my highest praises they are very good about developing a camera not only for PC, but also for the Mac Platform. The cameras I have mentioned are not the least inexpensive cams that can be purchased. In the long run you won't be sorry that you did. The second item you will need to complete the mission of becoming a webcam star is a software package.
Software packages come in all different prices and sizes.
The one that I find is used most often is Webcam32 . Webcam32 allows you to run your cam with a streaming or FTP method. A plus to Webcam32 is that they are continually updating the software and when you register it the updates are available for you to download immediately. There are several other programs that are out there, but for the money this program gets two thumbs up. If you are running a Macintosh Oculus is a great program of choice.