Takashi Okamoto has released a project called MiddlegenIDE, which is a plugin to Eclipse making it easier to setup and use Middlegen to reverse engineer code from an existing database.

Check out the website for more information:
http://ultimania.org/middlegenide/

We're looking into including the MiddlegenIDE project into the sourceforge Middlegen project. This is looking to be a real cool tool for Eclipse :)