I'm shopping for a USB webcam for home security. Image quality is not paramount, but USB is, because my cable box is connected to my G5 by firewire, and it stops working if there are any other firewire devices connected. There are $30 cams for Windows, but I can't find anything less than $80 that supports Mac OS (officially). Is there some juicy nugget out there that just happens to work with OS X even though it's not supposed to? Thanks guys.