For programmers working on java, IDEA is *the* IDE to use for all development. Most of the other projects like eclipse, visual studio .net 2005 are still trying to catch up with the features that this cool IDE provides (www.jetbrains.com).
 
There is an interview with the CEO of jetbrains at www.codegeneration.net where there is a discussion about "language oriented programming". Makes for a  very interesting read. And given their track record of doing things which seem impossible till they are done, I wont be surprised if they strike something big.