I found that I needed to connect to my Epson 3800 using Bonjour, under Mac OS 10.6 (Snow Leopard).
I first tried connecting to the 3800 as an IP printer, but was never able to get it to work that way under Snow Leopard.
Also, the drivers that Apple auto-pushes in their update package are the Guttenburg drivers, which I didn't care for.
So you need to first install the Epson driver, then the "Common Updater", and then add the printer as a Bonjour printer
(unless you are direct connecting with a USB cable, in which case none of this applies to you).
Hope this helps someone...