Update (5/15/09): the code has improved a lot lately and you can download updated binaries from my PPA repository. Directions for adding the repo to your package manager are available here.
Gonza, a developer from the HandBrake forums, added some updates to his native Qt4 HandBrake GUI, known as qtHB, to bring it a little closer to the current code state. I haven't had a chance to do any extensive testing with it, but I wanted to go ahead and post some deb binaries so any KDE/Kubuntu users can give it a shot.
32-bit qtHB (built on a Core2Quad Kentsfield)
These binaries are more up-to-date, but wouldn't package properly, so you'll have to download the qt4-core dependency (and maybe others) manually (sudo aptitude install qt4-core). Run it by double-clicking or by navigating to its directory and typing ./qtHB into a terminal.
32-bit qtHB binary
64-bit qtHB still to come
Leave me a comment if you run into any issues with any of it, or if you have any requests (rpm packages, etc).
If you're looking for CLI or GTK GUI builds of the latest code, check out my post here.