While I haven't downloaded this app yet, perhaps this would be something interesting for Lower School and the rollout of their iPads (along with Star Walk).
For those with an iPad (or thinking of getting an iPad 3 when they come out in the next few weeks), this sounds like a user-friendly, and FREE way to access Microsoft documents on iPad.
For the next 50 days, if you download the app to an iOS device, you receive 50 GB for FREE. In comparison, Dropbox only gives you 2 GB free...not sure if you simply sign up online that you still receive the 50...