Ian Selby has posted about a screencast that he did for Aptana:
I'm also posting this since we recently relaunched our screencast site, http://tv.aptana.com. It's actually really cool as its running entirely on Aptana Jaxer, and built with the soon-to-be released Active JS framework
The screencast gives a brief overview of the features the IDE has to offer and gives you a pretty good idea of what the interface is like. You can find out more about the tool on the main Aptana website.