Trying to create a new spreadsheet on the Tab, with either Thinkfree or Docstogo is an overly frustrating experience. Nothing comparable to what you can do on Maemo with Gnumeric or OOO. To be really productive on the go, office apps for mobiles have to grow an usable gui which compensates the lack of a hw kbd. It shouldn't be impossible since the multitouch but I don't know if they perceive the problem.