At the Bournemouth meeting last night, it came up that a few people were having trouble with 10.6 and printer drivers. My seemingly endless RSS feeds, with excellent timing, have informed me that both Epson and Lexmark have released new printer drivers today.
If you look at the list of printers as far as I can see it does not include the Epson Stylus Pro 3800, 3880, 4000 so it has not changed anything as far as A2 photo quality printers are concerned.