Are you a 10.4.3 user, but not a new "iSight built in" iMac user? Want to see at least one small piece of Photo Booth technology in action? It seems that the 10.4.3 includes at least one of the Photo Booth features to those of use without the new iMacs -- the "white screen flash" flashbulb.
To see this in action, open Address Book, choose a chard, and the select Card: Choose Custom Image from the menu. In the new window that opens, click the Take A Video Snapshot icon. You'll see a 3 - 2 - 1 countdown timer appear and then, when the camera goes off, your entire screen will flash white, just as it does in Photo Booth.
[robg adds: The custom snapshot ability has been there since (at least) 10.3, but it's definitely changed with 10.4.3's release. I booted into 10.3 to compare the snapshot feature ... and there's really no comparison. While the 10.3 version provides a quick and subtle background flash, the 10.4.3 version uses a you-can't-missi-it all white flash. In my darkened office, the 10.3 image was completely black. The 10.4.3 version was at least lit to some degree. Of course, it's not a terribly effective flash, but it does provide a minimum amount of light...]

