Video: a review of the Mac application Screenflow
ScreenFlow is an other nice screencasting software, available for Mac at around 99$. You can capture the contents of your entire desktop at the same time as your video camera, microphone and computer's audio. Sophisticated editing tools allow you to create great looking screencasts in no time. The finished result is a QuickTime or Windows Media movie, ready for publishing to your website.
Here is a video demonstration and review of ScreenFlow: