Surely that depends on what you want to do at the time. I have a bluetooth keyboard, which is great for serious typing when you have a table to sit at. But I can't flake on the sofa while watching TV, and use it while IM'img friends. I could (and regularly did) with my HTC Tytn, do occasionally with my n800, and am sure I would regularly with the n810 (when I get one). The only reason I don't more with the n800 is because the full screen keyboard hides what I'm doing. I know there are small BT keyboard, but I wouldn't want to hold the n800 in one hand and a keyboard in another.

I'm sure that I would still use the BT keyboard for sending emails, taking notes etc...