XQuartz, utf-8 and filenames
Okay, finally sorted with the help of this post:


http://lists.apple.com/archives/x11-users/2008/Mar/msg00202.html


In summary, go here:


http://www.rubicode.com/Software/RCEnvironment/


Download the preference pane, and add this entry:

Key=LANG Value=en_GB.UTF-8


I had already added this to my .bashrc and my .profile with no result. But I think XQuartz doesn't launch within that environment, so it never sees it until it is too late.