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Some USB video devices simply will present an on-screen dialog: "This Device Requires A USB 2.0 Port".
Frankly, Macs lacking USB 2.0 ports have hit obsolescence anyways.
If webcam chat or capture is important to you, spend your money on a new Mac first.
No manufacturer I'm aware of provides an OSX app to support buttons atop a webcam.
Photobooth can be VERY FINICKY about dealing with multiple cams on a Mac Book, i Mac or Cinema Display with built-in i Sight.
Newer versions of Photo Boooth do allow selecting your camera input choice from the CAMERA menu.
With older versions, you CAN use an external UVC cam as it's source *IF* you put the built in i Sight 'In Use' first.
Some cams won't display anything - or if they do you'll find your Frame-Rate is so abysmally low you'll just end up in sluggish, slow-motion frustration.Several companies such as Rocket Fish, HP, and Microsoft have 1 or more buttons on the camera to save an image snap to disk, send to email, or possibily to a printer.However, only Windows software has ever been written to support them. i Movie is only designed to work with a i Sight on an i Mac or Mac Book - or a Fire Wire DV camera source.Apple's built-in i Sight HD on the i Mac, Mac Book and Cinema Display line have horribly limited camera angles, so adding an external Mac webcam gives alot more flexibility.Particularly for adult sex web conferencing you want and need moveable, adjustable cameras.Start in your Apple Address Book: Family & friends with, say, @or @are good candidates for Apple Messages, i Chat, @for Yahoo Messenger, @or @for MSN Messenger buddies.