Printopia
Printopia is an application that you download from Ecamm and it allows you to print from either your Ipad or Iphone 4 even if that your printer is not Air print capable. One of the reasons that Iphone and Ipads owners were looking forward the ios 4.2.1 update was the ability to print directly from their Iphone or Ipad. However, unfortunately only a limited number of printers are Air print capable. Printopia allows you to print to any printer as long as it is on the same network as your Iphone or Ipad.