Dropbox
When you think about it, most data would be useless on an ipad but docs, etc are great.
I have almost 8GB of storage due to referrals (only need half that) but I can access anything I want and, with a couple of other apps on the ipad, open just about anything I want. 'Bout the only thing I can't open are ODTs but I can open and edit DOCs, PDFs, TXTs....