Having just upgraded, I'll give this advice.
WIPE THE CACHE (BOTH) SEVERAL TIMES
Maybe its me and bad luck but I've had trouble a couple times going from 2.2 -> 2.3.4
Don't try to restore any apps in titanium re-download them all and just restore the the data for the ones you need (angry birds
).
I had trouble both times I tried to restore the titanium "dialer/storage backup" I just decided I didn't care about my call history
That said OMG I LOVE IT... and most of the things I like most are sense 3.0 items and wouldn't be in the OTA anyway...