I noticed the reference to this in this other thread, and I think I misread the "cross-platform" comment. Is it only "cross-Intel/PPC Mac" at the moment? I downloaded the alpha [I couldn't find the announced beta anywhere], and although sources seem to be there, they're in a very unfamiliar directory structure (to a Linux-oriented person), so I assume it's directed only to the Mac.
It also appears to use Qt [somewhat obvious from its name...] which I don't have on my box currently. If the app is also aimed at Linux, though, I suspect it would be nice to have.