The Olympus P-11 is the fastest dedicated photo printer we've seen to date for 4-by-6 photos.
Olympus P-11 : Front Open Angle
Olympus P-11 : Back Top Up
Olympus P-11 : Front
Olympus P-11 : Tray Out
Olympus P-11 : Left Side
Olympus P-11 : Top Vent