Having upgraded to Snow Leopard, when I print to my Epson R1800 from Lightroom or Photoshop, the prints are extremely dark, and a bit oversaturated. I am printing by choosing a paper profile, and turning off color management in the driver. This worked perfectly before Snow Leopard. If I tell Lightroom to let the printer manage color, then use Epson Vivid with Gamma 1.8, the print is reasonably good. But if I can not choose a profile, I will be limited to only Epson papers.
The latest Apple update for Epson print drivers only contains the Gutenprint driver for the R1800, so I downloaded the latest Snow Leopard drivers directly from Epson. I believe I thoroughly removed the existing drivers before installing.
I am seeing some discussion about this here and other places online, but no solutions that work so far.