We've heard Google pays Apple millions to be the default search engine in Safari but now AdAge is reporting Apple (and AT&T) gives Google millions right back for AdWord advertising.

By comparison, one of Google's top advertisers that month, AT&T Mobile, spent more than $8 million on AdWords in June, a big month for the company, which was supporting the launch of iPhone 4. (AT&T is the third-largest U.S. advertiser, according to Ad Age DataCenter; it spent $2.8 billion on measured media -- almost $1.3 billion on TV alone -- in 2009. The company declined to comment on its search spending.) [...] Tech rival Apple spent just under $1 million on search during the month, as did chip maker Intel.

How much of that went to the keyword "Droid"?

[AdAge via MacRumors]