Thank You very much for information. I found N900 interesting, and, there is Gnumeric, it looks like there is Portabase, there is a nice set of software on N900. Few minutes ago i found Navit, although I don't plan to use GPS it'll be handy to have few hundred MBs filled with my city map!
I made a more or less to-scale comparison between keyboards of different machines which came to my mind (here), E61 has quite high and protruding keys while N900 looks to have more flat ones. And the more protruding the key is, the biggest probability that the finger will slip to another key and keys have to be in larger distances (as in some Psion machines or HP).
I can't exactly see in photos, are N900's keys more flat than E61's?

One more question: Is there xkbset in Maemo 5? The thing is that my diacritized characters can be entered the slow way (using on-screen selector) or with modification of "rx-51" file, using Ctrl-Fn combination, so I think about turning "sticky keys" for ctrl too. I did it once it in PC with Debian using xkbset.