Well, it is starting to catch on some other places in the Army already. 1/507th has an Iphone and Droid app for JM's and JM students. It can be found on their webpage on the Ft. Benning web site (which totally sucks, BTW, not surprisingly).
I downloaded it to my phone. It is huge (451 MB) but pretty well done and has a the relevant reference material as well as audio files of the pre-jump sequence. Maybe not something you want on your phone 24/7 hogging up space, but definitely handy for the upcoming JM student.
Guess I'll be listening to the pre-jump audio in my car on the way there.