... and you also can buy the Xerox wireless network adapter. The Europe PN is 097S03741. ;)
you can use both and still print to a Xerox device.
Regarding networking what you will be doing will still connect the Xerox printer using a cat5 cable to a wireless device that will be within your network, where eventually you will have your print server.
IF you want to take you printer wireless.... that is a different view. For this to work you will need to use a wireless adapter attached to the Xerox printer. As far as I know several wireless devices might work, nevertheless Xerox only supports one. The one mentioned on the thread by RuiPC.
I hope this helps.
We ended up using a Netgear WNCE2001 wireless bridge that works nicely. It's very small (deck of cards size) and was a breeze to setup. I would recommend it.