CalPrint - CalPrint uses your existing reminders and calendar entries on your iPad or iPhone (Exchange, iCal and Google Calendars etc.
QZ Tray - Print raw (ZPL, ESC/P, FGL), HTML, PDF as well as communicate with USB, HID, and serial devices...
Printer Pro - Print attachments, receipts, documents, web pages from your iPad and iPhone.
Print - Developers of application solutions for the iPad & iPhone. 'Printing on the iPhone: “There's an App for that” - Print & Share' as featured in Apple's “Office” iPhone commercial
PrintNode - PrintNode offers cloud printing solutions for web applications.
Print n Share - “Print n Share” for the iPad, iPhone & iPod Touch is the best printing and file sharing app.