Ya know, having seen the reports about the next OLPC/XO laptop being a dual screened job, it would be nice to see Nokia swing for the fences with something like that. Basically the same size as the N810 is now, but instead of the sliding keyboard, a folding one in the line of the Nokia E90.

Add an exterior display with buttons to control, or make it a swing and swivel set of screens so that one can view just one side at a time, or close it like a clamshell and that would be a neat alternative form factor.

Of course, such a design would need to have haptics. I would only expect those haptics to be smart though. For example, kick in when typing differently than when scrolling and not at all when just holding the device.

Throw in your requisited WiFi/BT/UWB/WiMax technologies, and maybe a dual battery setup and this is something that would be pretty neat, and defintiely paradigm changing.

Being that I've not really taken a look at the Maemo Linux/QTopic roadmap, I am not sure if this is something that can come soon, but it would be nice to see the N900 take a leap like that in terms of a hardware jump.