Got a bit confused for a while, until I realised that they've merged the project, classpath and source browser.
The XML editor now verifies and does tag completion based on DTD's and XML Schemas. It is superb. I was able to quickly find loads of different problems in some of my own schema files.
The local VCS is great. I had forgotten how usefull it was in Visual Age. The user interface for it is great. With a very cool built in Diff viewer.
JSP's can be compiled, so you dont have to deal with compile time errors when you've deployed your webapp.
Tons of more stuff. I have no idea how I ever coded before IDEA, and now it's even better.
If you haven't tried it yet go to IntelliJ EAP and download it.