I think it's a good move. (And congrats to the Zagats for executing the sale they couldn't make happen a few years ago)

However, I think it'll bring up an interesting point that we'll begin to see more and more of as Google continues to acquire companies - will they leverage SEO to make their own constituencies appear higher in search results than their competitors (i.e. Zagat higher than Open Table, Yelp, etc.)? Where does that fall in the ethics/morals side of things?

Interesting that if you own the means to information, you can choose what information people find (and thus, the decisions they make).