I'm working on a port of User-mode Linux to PowerPC Linux. It's mostly working, but there are still a few bugs to work out. If you want to help, let me know . The port is basically integrated into Jeff's code. There's still an annoying signal problem which stops init from working properly.
Bash now works, and things are generally less flaky.
I've fixed two major bugs. One occasionally confused ld.so in a way which depended on the number of arguments, and the other meant that system call failures weren't properly indicated, which confused everyone else. I'm trying to get a sensible filesystem image set up. I've got a Debian base image, but haven't been able to get far in booting it because there seems to be a problem running bash. The patch has shrunk again, as Jeff Dike has incorporated more of my patch into his tree.