I've included a photo of the Creative Web Cam Vista Plus, which is a really cheap, very basic webcam, which is Mac and PC compatible.
I hear this is a burning question for a lot of people, so I will attempt to provide some detail here with both a Mac and PC perspective. Also, if you're using any non-built-in webcams, this is where they should show up.Please click this button to launch the configuration options.Please remember to click the "ok" button at the lower right of the configuration page to save the updates.The bar has been set pretty high for answers to Burning Questions so I just want to help your answer be all that it can be. I spent another hour or so on it, trying to incorporate your feedback.Please make the changes to your instructable and then republish it and I will be happy to remove this comment, make it public, add it to the burning questions group and send you a t-shirt. (A lot of the additions are notes in the images, just so you know.) I understand that the standards are high for Burning Questions, so let me know if I need to keep working at it (though I can't think of too much more to add, as a lot of stuff about setting up the actual webcam is dependent on which webcam the person buys).