2008-Jul-28 - Usability test tool 'Silverback'

Sites and services put more and more attention on usability.
When a real user is trying the site, she talks about what she feels about it. This information gives great inspiration on how to improve the site or service.
That is what Silverback is for. Although it's for Mac OS only and sells about $50,
I think this kind of software is necessary.
The software is able to record tester's operation, facial expression, and talk, and makes a Quicktime video.
I think the tool is simple but amazing for usability test.

However I have not tried it yet, since I don't have Mac OS.