I've been printing more and more from my MacBook Pro running Windows XP SP3 on Bootcamp. Absolutely fantastic. IT actually runs as well as MacOSx, maybe better.
It is amazing how the author has maintained Qimage pretty much alone. It would take a lot of code and coders to port it to UB for MAc. So much that it's just as easy to run Bootcamp and hook up over the LAN for printing.