Aside from (possible) increased battery life, do you find anything added in Gingerbread which enhances your N1? I just discovered it pushed a "Books" app onto the phone, which I don't need (I have the Kindle app already) and can't remove.
That means you're on Android 2.3.3 Gingerbread for Nexus One now. Currently only you, other Nexus phone users, people running prototype phones, and people running CM7 have Gingerbread. Its an exclusive club that will soon grow.