The one thing that would almost completely cure any 810 envy I have would be a keyboard.

Since I use a Nintendo DS as a case for my N800, all I need is a slim 4.5" x 2.5" BT keyboard I can velcro into the other half of my case.

Is there such a thing? I've found three candidates, but none are close to that size, and they all look fairly clunky.

If I had such a thing, the only advantage the 810 offers is built-in GPS (a significant advantage, to be sure). But OTOH, I have 2 SDHC card slots.

Sure hope the GPS software from the 810 will work with my BT GPS, though.