Re: Mac OS X Leopard
At present, Gutenprint provides drivers for many Epson printers, but not for the 3800. As far as I can tell, they have no plans to develop one, either. Good point, though.
Back to the original point, Diana. I think you might want to look into Gutenprint (used to be called gimp-print). This is a print module and a collection of printer driver for gimp. MacOS comes with CUPS printer system and many printer drivers from gimp-print, but they should provide a more direct user interface than going through Preview.