Freefileviewer - Free viewer for PDF, DOC, DOCX, PHP, CFG, DAT etc. files
Documents by Readdle - A central hub for all your files.
Ubiquitous Player - Portable music player, image viewer, file manager, and more.
Documents Pro 7 - The ultimate all-in-one mobile office suite for the iPhone and iPad with 8 premium apps in 1.
FE File Explorer - The one-stop files solution
GoodReader - With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere.