VIA BACKPACK COMPUTING, I see that the price on the Nokia N810 pocketable tablet PC has dropped a lot.
Overall, I still think that the Asus EeePC is better for about the same money -- but you can't slip the Asus, small as it is, into a shirt pocket. And it doesn't have GPS. My Nokia review is here, my Asus review is here.
UPDATE: Coming soon, an even cheaper competitor to the Asus. (Via Brian Micklethwait).