Until yesterday, the latest 3800 firmware version I was aware of used to be o00573 (Mar 5th, 2007).
On the European Epson support page
, today I found a new version of the Epson Stylus Pro 3800 firmware, o02179. According to the name, it was released Sep 21st, 2007, but on that website it became available not before yesterday. I cannot find this firmware on the Epson USA website yet.