The Omnicore guys pulled a nice new innovation: a multilanguage IDE, currently targeted at Java, C# and VisualBasic.NET. The people here at IDEA forum should remember the Omnicore guys for the "back in time debugger" they implemented in the latest version of their Java IDE, CodeGuide.
I'd love to see IDEA evolve in a similar manner. There are already a lot of requests to support different languages, and having a pluggable architecture to add any desired languages would really rock. Do I heard someone whispering 'MPS' back there?