Price: $4.99 Download on the App Store
FileSync offers a solution to the dilemma of not being able to view your docs when you are away from your computer.
You have to set up an FTP connection in order to send files back and forth to your iPhone - a bit of technical knowledge you should make sure you can master before you decide to part with your $4.99. Once that is out of the way you should be off and running to file-sharing heaven.
The best thing about FileSync is you do not have to pay for an external hosting service that automatically syncs your docs for you (such as SugarSync or Syncplicity). The downside though is making sure you personally hit the sync button when necessary.
If you find that a task you can easily make sure to do from time to time, then FileSync should work just fine for you. The docs look good on the iPhone's screen and you can manuever them using the familar pinch and swipe methods that works in other iPhone apps.