Hey! I got my iBook to print to my desktop printer, attached to my Win XP machine! Okay, maybe that doesn’t sound impressive, but it’s something I’ve wanted to be able to do since I had the PowerBook 1400, and I’ve never been able to do it until now. Relevant links:
Gimp-Print — for PC printer drivers
Mac OS X Hints — search for “SMB”, “printing”, or something similar.
Essentially, you need to enable SMB printing, install relevant printer drivers, then add your printer, using the arcane syntax “smb://user:pass@workgroup/server/sharename”.