I've got an old (circa '01. 400mhz CPU and 128mb of RAM) G3 iMac that's about as usefull as a large, fragile paperweight with its current install of Mac OS 9, and it couldn't hurt to have another Linux box, so the only question is, which distro?
I was originally thinking about Debian, since I've gotten fairly comfortable using Ubuntu, been wanting to try it for a while, and most PPC machines from this era I've seen seem to be running Debian along with a lightweight window manager. The install process doesn't seem as user friendly as Ubuntu's though, and the G3 is a pretty arcane peice of hardware compared to most x86 boxes. So still being fairly new to Linux, I fear I may be left with a half bricked machine if I go down that path.
I considered Yellow Dog for a while, but I've kinda fallen in love with apt-get, and it doesn't seem to have as many packages available as Debain based operating systems do.
I've also seen Fedora and Gentoo suggested for iMacs like mine. Gentoo doesn't seem too user friendly, and while I'd be fine installing either of 'em on one of my PCs to screw around with, for this, staying as close to home as possible seems to be the best course of action.
So I guess I'm looking for a (preferably) Debian based distro that's user friendly and has good PPC support. Or a whole bunch of reassurance about the ease and compatibility of Debian or another OS like Gentoo or Fedora.
Oh, if all else fails, what about a flavor of BSD like FreeBSD? No apt-get, but I've been wanting to try BSD for a while as well.