I'd go for a Maemo based convertible-tablet netbook .... say 7" or 9" screen.

Could probably even fit some things that different people yell for (dual full size SDHC card slots, different types of video out, 1.8" or 2.5" drive bay for HDD or SSD, PCI-Express Mini card for _optional_ WWAN, huge (relative to an N810) battery capacity, gobs more memory).

Yup, I'd buy one of those. Hopefully before 2011 though. Like, this year. If I knew it was coming, before the Asus T91's Ubuntu version (or the CTL 2Go tablet Linux version) is on the street, I'd probably wait for that as my spending target.