A preview of
what to expect in Qt 4; the new Qt toolkit will have better multiplatform support, a new paint engine and text engine (with proper font kerning), a neater API (with nifty container classes, Java-like iterators, and a more property-based API that's easier to bind to other languages), and will produce smaller, faster, more efficient code. TrollTech are positioning it to compete with Sun's Java as a multiplatform widget set.
(I hope the thing about easier bindings makes it easier to interface it with Python; I mean, PyQt works reasonably well, except when it fails to compile, as was the case on a Solaris system I was working on. After attempting to recompile everything, including Python and Qt, but still failing to get it working, I gave up and rewrote the project in Java.)