Where I work we do a lot of usability testing - so maybe this may be useful:

In short, Silverback turns a Mac into a portable usability testing laboratory. What used to require a complicated and cumbersome set up involving several computers, a video camera, and lots of time, can now be done much faster and with less hassle. You only need a Mac with a built-in or attached camera, and a copy of Silverback. The application records video footage of the user, and combines it with recorded footage of their activity on screen. Clicks, inputs, pointer movements and the user's speech and facial expressions are all combined into a single video file that can be quickly exported. One nice touch allows the test facilitator to add "bookmarks" during a session by clicking a button on the Mac's Apple Remote. Nothing distracting will show up in front of the user, but the bookmark is still recorded invisibly in the background. [From Silverback now available]

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