Have yall heard of the TEFView App for iPhone,iPod, and iPad? I just learned about it today, and it's made my iPad an even more useful device in learning to play an instrument.
Essentially, you download the app, put in a certain address it gives you into your web browser that is specific to your device, and you can add all the .tef files you want. Now you have the convenience of carrying your .tef files everywhere you go. For this truck driver, that's more than a dandy!
I haven't explored everything yet, so (like most apps) it probably isn't as user-friendly as the computer version, but it sure beats a poke in the eye with a sharp stick.