Here is picture of N800 and Nokia bluetooth keyboard. It's nice combination and really works. Only thing needed would be small bt mouse, since touching screen with key tends to move whole N800 away.
But still, X-term and SSH sessions are joy with that keyboard. Only problem I noticed was the new Mozilla based browser for N800: there seems to be some trouble when filling forms inside that browser with keyboard.
But if you are not going to ride with wave and stick in with default (really nicely working) browser, you should be on safe side.
Picture of N800 and folded away bluetooth keyboard: