You may have to launch, relaunch Photoboth, un-plug, re-plug your external Mac web cam to get Photobooth to recognize it, but it's doable. But it's the video capture or chat programs you use often can't take advantage of it.Or it's the fact that you simply CANNOT BLAST 30FPS of High-Definition 720p or 1080p HD image data over a slow DSL or Cable modem connection, Period. Your expectations about webcam frame-rate may not be realistic.If your webcam is dark or has color-balance problems, i Glasses can correct and help compensate for many image quality issues.
They may or may not actively use chat programs, but at least this is a starting point.
Many social networking and adult profile sites often have webcam chat rooms you can join if you so choose. It's the most fully featured Mac/PC Cross-Platform webchat experience available. It has both G-rated and X-rated rooms to visit, online member status and more. It offers a built-in community you can browse & optionally connect with.
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.
Well worth the program's cost after the 21 day free trial. Apple's Messages and i Chat for Mac lacks this community.
But in addition to the popular Mac video chat apps listed, many Social and Adult webcam chat websites feature video chat integrated into the webpage and list people online.
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.
Apple intentionally does not allow external USB Mac webcams to be selected as a video source in i Move. Try a special hack from Mactaris that allows i Move to 'see' an external 3rd-party web camera.
Otherwise you'll simply need to record your video with some other Quick Time compatible video capture app - then bring it into i Movie for editing.
And unfortunately, Apple doesn't have a Webcam Preference Pane in OSX.