I'm using the Linux 64 version (which is more appropriate for the hardware I've been setting up this weekend), but I would think all the platforms are supported equally well; the Qt guys always seem good at doing that. (Which, I guess, only makes sense, as Qt is supposed to be a cross-platform dev system. )

Hmm. I have to admit, I've never managed to successfully set up the pre-Qt scratchbox dev environment. As the Qt SDK comes complete with compilers, debugging tools, emulators, IDE, etc., it's a heck of a lot easier to just pull down the one executable and hit "install" than to go through all the steps to manually set up the scratchbox system. (Plus, I've been doing most of my work on an OS X box, so it's nice not having to set up some dual-boot or VM in order to run the dev environment...)