My main problem is pretty much the overall instability and brittleness of OS2008 on the N800, making virtual thumb keyboard use, well not very usable. Talked about it here:
http://www.internettablettalk.com/fo...t=16365&page=3

Screen tap goes to random places / Especially when typing fast on full screen keyboard
One key input causing multiple repeats
High pressure sensitivity with no configuration
Finger tap not bringing up finger keyboard

Wonder if such a problem exists on tho N810, although those users r most likely be just using the physical keyboard, so the problems above are not as apparent. Either way, it's no reason for a newer non-beta version to be less stable.