Doesn't look too bad.
But it could use a class view (I installed the stable version since the unstable got me a uncorrupted zip file), and it would be good if you could add the features of each release on the home page.
It is VERY similar to QDevelop, I think it could be an interesting idea if the two projects would merge and cooperate.
This will result in a fast evolution of a good Qt4 cross platform IDE, instead of going half speed in parallel...

Continue the good work!