There is an online screen recorders called Screenr. I've been meaning to write about it for some time. So I've been checking out some of the videos and found a good example explaining how to used Audacity to clean up audio:
Screenr works independent of your operating system so Mac, PC and Linux can create screen movies and tutorial content. It is free, you sign up for membership to set up your account. You can tweet announce your videos or just embed them in your blog or web site.