Thanks to everybody who's posted hints on here to get me going! I had to do a slight variation mixing a few of them to get my XP laptop printing via Airport Express (G4 and Powerbook were both printing fine already).

-connect all the cables to airport express and turn it on, verify that all computers can access it - i.e. they should all have internet connectivity at this point
-open printers and faxes in XP Start menu
-click add printer
-select "local printer attached to this computer" and deselect "automatically detect..."
-click create a new port, choose standard TCP/IP
-enter 10.0.1.1 for printer name/IP address
(yes, to this point the instructions were exactly the same as the airport express doco)
-select Custom instead of standard device type
-select Raw LPR to port 9100
-select next, choose your appropriate printer when prompted (and name it), select finish

Sort of a combo of some of the other responses on this thread that finally worked for me. Good luck!

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Just to make sure, you're using LPR, right? If so, what are you using as your queue name?

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