Howdy,
Just thought I'd drop you guys a note so say that I've managed to get a Fedora (rawhide) s/390 system up and running. The installer has a few issues that I'll put through into bugzilla and there are of course a few interesting quirks with the kernel being compiled with gcc4. But I'm running what I believe is the latest kernel (I re-built it from the srpm as it isn't available in rawhide most likely due to the 'quirks' I mentioned earlier :-) )
uname -a Linux slayer.starbiz.com.au 2.6.11-1.1233_FC4
It's been an interesting exercise so hopefully I can now work to address any bugs / issues I find
-goc-