I've been trying to keep up with the osx and the linux ppc news, although I know a bit more about osx I'd bet. (dual boot)
On the OSX, there is a darwine project, and a native kde port project, and of course various programs, such as blender, wings, gimp, and openoffice with versions produced for it. (gimp is 2.2 on osx @ gimp.org, blender is 2.36 on osx @ blender3d.org, wings is .98.26 on osx @ wings3d.com, and openoffice is 1.1.2 on osx @ openoffice.org)
The only thing about osx is, that while it's nice and powerful, it's gui is, well, bloated. That and the registration... could do without that, I think. YDL makes you feel like your computer is fast and speedy. But the versions come slower unless you compile them yourself. And it seems like the newer the computer you have, the less likely linux ppc will work well on it. Although, that's probably just a false appearance.
Either way, I was wondering if there is a wine port to ydl or something like that?