I tried os2008 on my N800, and I will go back to 2007.

On the positive side, it is faster and videos play a lot better. Flash 9 works. The internet experience is better.

On the negative side:

-apparently Nokia has broken the libs again. Most 2007 or 2006 software won't install. I tracked that down to a conflict between hildon-libs0 and the new osso-af (I'll post a separate thread on that subject).

-I find the new interface both ugly and wastefull in screen space. Are Nokia's designer color blind or what? Can somebody please pack the old themes so that they can be installed on os2008?

-since the upgrade my router crashes regularly (I'll post another separate thread on that subject too).

IMHO, it is not ready for prime time. And I suppose that this is why the N810 (allegedly shipped to the distributors) is not on sale yet: Nokia is probably waiting for the applications catalogs to be updated with os2008 versions of Skype or Gizmo.

Opinions are not facts, your opinion may differ. But I go back to 2007 for the moment.