The OS is actually fairly easy to navigate by just using the DPAD.

and Qwerty's got the touchscreen working on both the N810 and the N800.

The issue is just that nobody's written an open-source soft keyboard for the Android platform yet. :/

I don't think it would bet that difficult but then again I haven't looked at Android since it's first release when I wrote "Hello World" with the first iteration of the SDK