There have been hints for that using Jaguar and CUPS. In Panther, it works without any special work under the hood -- just switch on "Printer sharing" and "Windows sharing" in the Sharing preferences panel. In Windows, add a new network printer; you can find it by browsing. But now the important thing: When Windows asks to select a driver for the printer, select any PostScript driver like the Apple LaserWriter or Color LaserWriter instead of the printer model you're using.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040208122655345