There is now a Qt integration into Eclipse provided by the good folks at Trolltech.
You can check out the press release here.
There is a sneak peak article here and you can download it here. The best thing about it is certainly the integrated form editor.
There is a little run-through/review type thing here and even more info here.
Unfortunately I don't think I will ever get to use it in a commercial environment due to the cost, but it could be good to try out for cross-platform development.
