This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Eclipse is an open source IDE (Integrated Developer Environment). It's considered a framework because you can modify it so much and add your own functionality / customize it for a particular application. www.eclipse.org is the main website for the project. They have lots of articles listed there, too. They should bring you up to speed on what its all about. I'll move this to the IDEs and Other Tools Forum where they talk about Eclipse a lot. Please continue the conversation there.