For those who claim that Our Google Overlords, praised be their names, have plans to blanket the earth in Wi-Fi in exchange for precious ad revenue, think again: A Google exec said the Mountain View network wouldn't have ads on it. They've said before that the San Francisco network likely wouldn't initially have ads, either.
Interesting side note that Google is working with amateur radio operators or hams. Hams have some licensed use of part of the 2.4 GHz range, although that's rarely come up as a conflict. It's obviously in higher use in Mountain View or the issue wouldn't have been raised.
(Oh, and the group who are those who claim...I'm talking about you, Om.)