Adobe Reader
How annoying was it for iOS users, to constantly look-out for pdf readers on the App Store, but never be able to lay their hands on the Adobe Reader. So, all iOS device users, your plight has ended, and Adobe Reader is finally a member of the iOS clan.
Adobe Reader has been the most used PDF document viewer for years, with full support for PDF Portfolios, password-protected PDF documents, and Adobe Livecycle rights. Whats more, users also get the functionality to print PDF files wirelessly via AirPrint.