I just came back from my local Costco, checking out the Epson7880 printer they have for poster prints. Drycreek provides color profiles, so I had to check it out. I basically followed the instructions (http://www.drycreekphoto.com/icc/Cos...rPrinters.html
), printed from Lightroom2 into JPEG using the custom ICC profile and dropped the file onto a memory stick. The technician at Costco was very helpful and even reminded me that the profile I used was three months old already. ;-)
The result was pretty darn good, I am happy with it, and you can't beat $6,- (incl. tax) for a 16x20 print!