I like the new OS so far:
- interface seems to respond better
- scrolling long menus is faster
- it is easier to select text in the browser without panning
- can see YouTube videos
- Power + Lock touch screen and keys seems smoother
- scrolling seems easier in the RSS reader (it used to stutter for me)
- and there is the N800 video included rather than just the N93

it feels like the "SP1" version