I ran out of time last night to do the comprehensive review, but I thought I'd just post the results anway. After ordering 4 test prints from 7 different vendors (see the original 6 here, with Photoworks.com added later), and asking a bevy of coworkers for their opinions, the unscientific winner on quality is: Imagestation.com Snapfish.com, came a close second. I have plenty of notes, technical discussions, etc. planned. But since I'm at work right now, I'll do that all tonight.