OpenZaurus is an alternative ROM image for the Sharp Zaurus PDA. The main website for the OZ project is http://www.openzaurus.org, where you'll find copious amounts of documentation and FAQs, including:
This document was written to describe working specifically with OZ 3.1rc2, and I'll make every attempt to keep it up to date as new versions come out. What that means is that I've made no effort to document OZ 3.0. If you're using an earlier version, you're on your own.