I was looking for a way to print from my iPhone and iPad when I'm using a PC and don't have Airprint. After a lot of searching, I found Fingerprint by Collobos Software ($9.99). If your printer is on your wireless you might want to check it out. There's a free trial version on their web site so you can make sure it works before buying. My printer now shows up on both my iPhone and iPad when I go to the "print" icon, just as if the printer came with Airprint. Great program.
