(without having read all the pages)

On the very top of my list are:

* full USB support
I don't care about the implemented connector size or shape per se as long as there is an adapter to get it to a regular USB port size. Though in my opinion, there is enough room in the thicker part of the N800 to stick a regular USB port. It is a matter of priorities.
I want to be able to attach and use:
- a USB flash drive
- a USB printer
- a media card reader dongle
- USB GPS receiver

* better camera
Either place a 2 or 3 MP autofocus lens on the back face, or place a better camera in the the pop-up rotating camera.

* regular SD card slot

* improved screen for outdoor visibility

and other hardware improvements like considerably faster CPU (not marginally faster), double the ROM & RAM at least. Eliminate video bottleneck.

I have not been able to try the keyboard on the N810, but I would probably like that slide out keyboard in my next tablet. With the keyboard optimized for those with slightly bigger fingers. Right now it looks tight ... but it could very well be that regardless I could only type with one or two fingers.