Apple actually released a set of office programs for the iPad that are compatible with word, excel and powerpoint. I saw it on iTunesU, so I'm not sure if you have to be a student or not.
My one gripe with the iPad is that they do not have an HDMI output, but then the tablets that do have the outputs (HTC Flyer, Motorola ZOOM) are about twice the price of the iPad, so...
http://www.amazon.com/Cable-Matters-iPhone-Generation-Adapter/dp/B004GTCA2C