Will iAd Lead to Rapid Rearrangement of Mobile Ad Network Rankings?

Google, at the moment, runs the biggest U.S. mobile advertising network while Apple currently ranks about seventh.

Apple certainly does not expect to remain seventh, and most observers likely believe Apple will ultimately rise up to the top ranks.

That might happen faster if AdMob clients shift over to the iAd network, since the iPhone now accounts for the majority of AdMob revenues.

It wouldn't be unusual if Apple and Google found themselves in the top-two spots before long.