Obviously, it borrowed a lot from the HP iPrint, except it works with all printers – Air Photo Wifi Printing Review

The workflow is almost exactly the same. You start form the photo albums. Takes one tap to go to Camera Roll, another to go into the photo, then another tap to print. The server needs to be installed and running. I had a little trouble on XP because of the firewall. Just needed to add the server to the exception list. Then it is all smooth sailing. The iPhone app automatically finds and connects to the server (no tap needed). So, assuming your have the server installed on one desktop only, and it is running, it takes three taps to print a photo. Way easier and faster than syncing to the PC and print.
Review by Johnqh on Air Photo Wifi Printing.