What are some alternatives?
When comparing Air Sharing and Printer Pro, you can also consider the following products
CalPrint - CalPrint uses your existing reminders and calendar entries on your iPad or iPhone (Exchange, iCal and Google Calendars etc.
ePrint - If you have the right printer, “ePrint” will let you print directly from your iPhone or iPod touch.
AltaMail - A treasure trove of features make AltaMail the best email App for iPad or iPhone for auto reply, auto filing, managing and saving emails, attachments and other files.
QZ Tray - Print raw (ZPL, ESC/P, FGL), HTML, PDF as well as communicate with USB, HID, and serial devices...
Pogoplug - Pogoplug is cloud storage which provides unlimited storage.
Printix - Printix is a cloud-based print management platform.