iPrint
Print anytime to nearby wireless Epson printers. Print photos, webpages and files including Microsoft® Word, Excel®, PowerPoint® and PDF documents. You can even scan and save your file or send in an e-mail. Also supports online file services such as Box, Dropbox or Evernote®.Download at the Apple Store
PrintCentral
Print to ALL printers (Not just AirPrint Printers). Print direct to most WiFi/Wireless printers without additional software. Print to ALL printers and any document type via your Mac/PC. Print remotely over 3G and in corporate/other networks where WiFi is not available. View, store & print email, documents, files, attachments, photos, contacts and web pages on your iPad.Download at the Apple Store
ePrint
ePrint solves to print directory from iPad,iPhone or iPod touch. For ink-jet printer users: Canon, brother, Samsung, Lexmark ink-jet printers are not available on ePrint.