If you are looking for a great screen-cast product look no further. Check out ScreenFlow. It's made by the same folks that cooked up Flip-4-Mac WMV plug-in for QuickTime. 

Screen Flow is a super simple yet powerful application that captures your display video and audio. The apps editing interface brings an iMovie simplicity to editing the resulting video file. Exporting and distributing the final product is also very simple. It's a Mac-only app and it costs $99 USD, however that includes two activations of the license.

Enjoy!