Search, GMail and Maps are the only 3 things I used. I don't even use Calendar, My Maps or their Cinema search whatnot. That's pretty much their products that I know of (and most of my friends outside Valley)
Google on the other hand is teasing me regularly with brandnew interesting API's (for which I never find the time to really check em out).
Well, time for new API's... maybe next year. If facebook is still the hype in 2008 ;-)