from:
http://trolltech.com/developer/qt-creator/Qt® Creator™ is a new, lightweight, cross-platform integrated development environment (IDE) designed to make development with the Qt application framework even faster and easier.
Tailored specifically to the needs of Qt developers creating cross-platform applications
Focuses on features that boost developer productivity without getting in their way
Open and extendable; integrates familiar tools and file formats
The final release of Qt Creator is planned for early 2009.