Nokia has a lot of interesting bones...
Nokia has some potential only its not well organized.
The N810 could be viable as a product if they had some removable external storage and a cell phone.
I agree that Nokia's GPS units are weak. They work well enough to let you know roughly where you are. In the city, its hard for them to get a good sat signal and for some reason they don't recognize position from nearest cell tower like an iPhone which lacked GPS. (Its supposed to be the fall back).
I have the E90 because of the keyboard. The camera is slow . There's a camera on the inner screen that looks like it would be good for a vid conference but will only work in the EU 3G, not on wi-fi.
Again the E90's GPS is barely adequate. This is due to their choice of lower power chip sets and its a smaller chip set than what you find in other GPS systems.
The potential is there. Its just that the software works barely well enough. Better code, better apps and they have a chance.