I know I'm quite late to the party but I finally got around to downloading and installing Domiclipse in Eclipse due to Bens post and I must say that it is very nice! There was a little caveat in the the installation via the Update Site in that I had to uncheck the "Ignore features not applicable for this environment" setting on the second page of the dialogbox to have all three components show up. Otherwise I would get a "missing required component error" during the install. In my defence it wasn't the most logical setting to disable. :-)
Anyways - it's up and running. Nice!! I got to go grab the source code I think.