Interesting and good looking. As Crumb have said something similar for c/c++ would be useful.
In fact I have started something in this direction in October 2010, too bad it has been abandoned since. Still I have sources on my private repository, so who knows, maybe I will revisit the project.
I'd pay good money for such a thing! :)
1.67GHz 15" PowerBook G4, 1GB RAM, 128MB Radeon 9700M Pro, 64GB SSD, MorphOS 3.15
2.7GHz DP G5, 4GB RAM, 512MB Radeon X1950 Pro, 500GB SSHD, MorphOS 3.9