Here's a couple of links I googled:

http://sourceforge.jp/projects/zaurus-ja/
http://takahr.dhis.portside.net/cgi-bin/rwiki.cgi?cmd=view;name=Ruby%2FQte%3Aen

I guess I answered my own question :-) Can't wait to give this a try. I
know a few years ago I really enjoyed running VNC, SSH, GCC, MySQL,
Apache, and other things on the Zaurus.