Silverback brings advanced usability testing to the Mac
Silverback basically turns your Mac into a full-featured usability testing station. Add a new project, add some users, and have them come sit down and test out your interface. Silverback hangs out unobtrusively in the background, capturing video of the the entire screen, including a cute (and useful) effect that marks where your tester is clicking. This in itself would be handy, but Silverback also takes advantage of your built-in iSight camera to include a picture-in-picture of the tester's reactions, on top of the screen capture.
This way, you can see everything the user is doing in real time, and they can speak comments aloud as they come up, rather than pausing to write them down. Usability testing the old-fashioned way generally involves expensive setups and lots of instructions, but Silverback is intuitive to use and provides straightforward and informative results. Silverback is currently in private beta, so some testers can test its testing functions (this makes our heads hurt a little bit.)