Silverback is an application for Mac computers that also records a user’s screen and voice as they browse a website. The interface is extremely simple and meant specifically for moderated usability testing. The program carries a one-time fee of $49.95. If you have easy access to people with whom you can test your site, and a Mac laptop, this is a great solution. You simply arrange to meet somewhere with Internet access and run the test. You end up with a recording that you can easily edit and post on the Web. The software even enables webcam use to embed the user’s facial expressions in the corner of the final recording.