Just an FYI for anyone printing with Gimp-print over USB. I got to the usbtb - high performance CUPS printing page from the Gimp-Print support forums and downloaded the provided usbtbUSB driver. Previously, I couldn't get Gimp-Print to work at all with Panther, but when I downloaded this driver it worked! And it was fast, too.
Plus it shows the ink levels in my Epson Photo 820, although the display is a little awkward (I had to resize the progress window a lot to show all of the inks).
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040627052026709