Coming back to my last post, pata_macio was only introduced very recently (28.11.2011). So I would use an iso, which was spinned end of November 2011. People, could you please test this iso:
G3/G4 : http://d-i.debian.org/daily-images/powe ... t/mini.iso
I semi-successfully installed using this one today. "Semi", because it gave me errors a number of times. I had to redo some steps up to three times (files failed to download and yaboot failed to load properly the first time) and based on previous experience, at the end I went to TTY2, chrooted to /target, and using bash as my shell I set up my fstab with my other partitions, then copied a known working xorg.conf (from Xubuntu LTS) to /etc/X11/xorg.conf.maybe.
After restarting, it wouldn't start X, and upon rebooting again gave me the oops message I've been getting a lot of lately (see above posts). However, while typing this, it has rebooted and X is working at 256colors, but windows are flashing and move down the screen to never be heard from again. Mouse clicks don't do anything, but ctl-alt-bkspace works, and after using it windows don't seem to be acting up the same way.
Wired networking is "not managed", but wireless supposedly connected, even though I hadn't keyed in my password, so that's not quite right, either. When I put in the key, it didn't connect, however it started managing the wired connection. Weird!
But, yes, MintPPC11 is up and running on my 700mhz eMac, using the installer you wanted tested. OS9, OSX, and Xubuntu partitions show up in pcmanfm. Oh no, spoke too soon. Upon rebooting with my "known good" xorg.conf, I keep getting the same "oops" message I mentioned above.
Edit: I can get into the filesystem from Xubuntu, if anyone wants to see logs.
Re-Edit: After re-setting PRAM, it rebooted properly, but still 256 colors.