New IDE for Mac OS X written in Cocoa (WIP!)

avenue33:
OS X brings a free and nice IDE: Xcode.

Instead of working on another IDE, why not work on a plug-in for Xcode?

What do you think?

Something like this?

http://medesign.seas.upenn.edu/index.php/Guides/MaEvArM-starting-mac

It is possible to configure it and use everything from XCode. I've done it before, but I'm a geek and I like the makefile.