After a bit of googling, I found that you have to run the spadmin script that pops up in the OpenOffice install in order to get it to talk to you printer.
As you (not root), do the following in X:
/usr/lib/openoffice/program/spadmin
A little win-like interface pops up, and it's easy to click through it to add your new printer, which should show up. It did for me, at least :-).