[bzzzt]

I used an N900 for a few years (got one with the early adopter discount when it was released). While the keyboard was miles ahead of all the on-screen stuff at the time I don't think I want to go back to that keyboard from a current decent touch-screen phone. The keys were a bit too small for fast typing...

[u801e]

I wonder how it compared to the keyboard on the N97. Though it was a symbian based phone, the putty client allowed you to connect to a server and attach to a screen or tmux session, which worked okay with that keyboard and a few on-screen buttons.

[seba_dos1]

The key size is alright, I'm able to type on it much faster than on a touchscreen - provided that I don't need to use anything else than regular letters. The most painful thing on that keyboard is lack of 4th row of keys.