Nice site! The labels are a bit clumsy, though. Have you considered using alternative visualization, such as treemaps? I use plottit to navigate through reddit threads because it shows comments arranged by karma in a treemap.
Is there something like ipython for Haskell? GHCI is fine but some subtleties are missing. Like typing a prefix and going through a subset of the command history. And also the numpy/scipy/matplotlib toolkit that come with the -pylab option would be great!
He likes the application and has gone through a lot of beta testing with friends. The problem seemed to be that he was not willing to put more effort into pushing the project.