"Looking to learn more about the different projects involved that make up Eclipse? We are running a series of free webinars to help you better understand how you can use the different Eclipse projects. Take a look and sign-up today."
Free Eclipse webinars via Eclipse in the News.
What my ears found nice was the series of podcasts about callisto top level projects on http://www.javalobby.org/spotlights.jsp
Good introductory stuff about all those projects.