I love my iPad and have been finding I can do a lot of my normal day to day stuff on it but can't find a decent app that works with Quickbooks data. There are a couple apps that will import 2006 and older, ie.. useless really, Quicken data but nothing updated to work with anything current.
Even QB for Mac OS X has lagged behind the PC versions, so QB for the iPhone/iPad OS seems unlikely. Perhaps some third party will step in to fill the gap as with Docs to Go for doing MS Office things.