Amer Chaudhry has a good high level view of .NET / J2EE interopability:
It will tell you all you need to know to get a background in this area if you have never looked at J2EE before.
I’ve also covered this topic inside my company recently, and am considering writing something about it on this blog in 2008. I’ve touched on NetBeans as my learning tool for J2EE before.
Which reminds me, goodbye 2007 and happy new year! 🙂