Recently, I started to play with Qt 4 also under Windows, in order to be able to port some of my Linux applications that use Qt. Usually, I'm using KDevelop under Linux to develop Qt applications, but under Windows? Then I noticed that Trolltech provides Qt Eclipse Integration, i.e., an Eclipse plugin to program Qt programs with Eclipse. So I gave it a try...
IMPRESSIVE, really a nice piece of software!
The installation is immediate, and you get a menu item to run Eclipse already setup to start programming with Qt (relying on the CDT plugin for the C++ part). To try it, I followed the tutorial you find here.
The new project wizard now provides also Qt project options:
And note the nice project file editor