The keyboard issue can be solved with a docking keyboard, or by purchasing just a dock and a (separate) Bluetooth keyboard. Discussions are going on at
www.mac-forums.com. There does not seem to be support for a mouse. The big driver is Pages, the only bona fide word processor on the iPad so far, imo. I suppose you could write a 100+ page document with other apps, but Pages is a lot cleaner (and hopefully stable). So, where Pages goes, so goes the rest of the mob. It would be great if they could implement certain mouse functions, to eliminate the need to touch the screen.
Steve Jobs needs to get a handle on his megalomania and quit dictating all aspects of the UI. Every now and then, he should accede to the customer wishes.