Canon released Easy-PhotoPrint app for iPhone

Canon has unveiled a new free application called Canon Easy-PhotoPrint for iPhone (Canon iEPP) that allows you to easily print photos from your iPhone or iPod touch on a compatible PIXMA printer via a local wireless network (Wi-Fi). If you have Canon PIXMA MP990, PIXMA MP640 and PIXMA MP560 All-In-One printers, you can enjoy this application.

Canon Easy-PhotoPrint for iPhone Features
+ Select multiple photos from your iPhone or iPod touch Photo Albums and print up to 20 copies
+ Print bordered or borderless photos
+ Easily select from a wide range of paper sizes and paper types
+ Start your iPhone camera directly from Canon iEPP and instantly print captured photos
+ Automatically find printers on a wireless network when launching the Canon iEPP

You could download the Canon iEPP app for free via the AppStore.