There is an excellent application for Qt beginners which is distributed with it called 'demo' in $QTSRCDIR/examples/demo that shows you all the wonderful widgets you can use to build a UI and shows off Qt at the same time.
I have been searching for an official KDE equivalent and the closest I found was to use the Qt Designer built from KDE's CVS module copy of Qt called 'qt-copy', which will of course let you visually draw your UI (KDE classes are there so I don't think the official Qt version would have them but I don't know for sure).
This is very nice but I noticed KMDI classes aren't there so I don't know how recent the designer is. What I think would be a very good helper for newbies like myself is an appication like 'demo' for KDE that shows off all KDE widget features (ever better, idealistically, letting you play with all those odd class properties in real time like selection modes for KListview items, etc).
Anyone know if, perhaps, such an application exists today?