The Sharp Netwalker (successor to the Zaurus line) [http://pricejapan.com/front/e_good_i...76&category=5] seems to be about the closest to an n810 successor that I've seen. 5 inch display, keyboard, wifi/bluetooth, Ubuntu OS, ARM-based Freescale CPU, MicroSDHC (the N810 has dual full size SD, but the micro cards have come up in capacity), 4GB internal flash, 512MB RAM. Street price in US seems to float around $500.00