Adding my 2 cents.Wizprint uses the serial port of the the Zaurus. Basically the printing job is sent via the serial port and Wizprint directs it to the printer. It is a nifty program. I have been using it since it first came out.
You can also buy a Parallel Converter. Basically its an adaptor that allows you to use your serial port and connect it to a printer cable which then connects to a printer. The cost is about $100 or so, but you are going to have to search for it.
There are also infra-red adaptors that allow you to connect your zaurus to your computer or a printer. The parallel converter might be the best solution as you figure wizprint may not work in XP.
-ZD