Technichally you can,
http://www.internettablettalk.com/fo...ad.php?t=19639
but you have to copy the entire OS to the SD (A 2g one is preferrable) then, whats left on the SD becomes internal memory (and I think you can still use the REAL internal memory to save stuff) works on my N800 just fine. If you need to reflash the tablet, you need to install bootmenu(somewhere arount this forum) to start booting from th SD again. Hope it works