So far, we use it for classroom walk throughs and I type my classroom observation notes on it. I downloaded the Evernote and Dropbox apps for this. Evernote is cool because I can type notes on my IPad or IPhone and it will sync with all my computers. Then I can edit or print when I get back to my office. I can also get the same notes at home on those computers.
We haven't even begun to use it in full force at our school, yet. We are willing but just don't know what apps to use and make good use of yet. We get email and do some other simple things, like pictures, etc. but we would love to have some good software or apps just for school use. We would like to have our observation form and other forms loaded and usable, but haven't got that one figured out yet.
I think once you get started using it, you will find ways to use it that you didn't think of. Also, discussing ideas with other administrators will help you.
Good luck. I love mine.