CalPrint - CalPrint uses your existing reminders and calendar entries on your iPad or iPhone (Exchange, iCal and Google Calendars etc.
Printer Pro - Print attachments, receipts, documents, web pages from your iPad and iPhone.
Air Sharing - Air Sharing lets you bring your documents with you — without bringing your computer.
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...
ClipPrinter - opy items from other Apps and transfer to another iPad/iPhone/iPod Touch via Bluetooth/WiFi, or to/from your PC/Mac via WiFi.