Does anyone know of a great Qt tutorial for using the designer, I'm new to Qt but I'm intermediate in C++.
Although not a free tutorial, this book from O'reilly is amazing. It will get you completely up to speed with programming Trolltech's Qt and using the Designer.
Trolltech themselves also offer very extensive and great documentation. In particular check out the Qt Designer manual here. Another useful page is their class reference here.
Also consider follwoing through their 14 tutorials by example here. Athough these tutorials do not work directly with the Designer, you will learn how to use it as you follow them through.
Qt (4) comes with an absolute mountain of documentation, so you might find what you want there.
If you've got a full installation you should have Qt Assistant available (run the assistant
command) which has a few starter tutorials. If that's not enough then have a look in the qt-demo module, which contains a few (fairly substantial) example programs and full source code.
The "official" book on Qt3 is available for free. It is outdated but could get you up to speed. Be warned that many many things have changed in Qt4. In any case the "C++ GUI Programming with Qtx" series is IMHO the best resource available for Qt new comers.
Available online is also the book Introduction to Design Patterns in C++ with Qt 4 which could serve both teaching you C++ and Qt4. I wouldn't call it my favorite book in any of both subjects though.