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We’ve been talking a lot lately in the halls of DoublePositive about “mobile.” We talk about the emerging opportunities in mobile advertising, what this means for lead generation, the VC activity in this space, and how companies like Mobile Posse, Millennial Media and AdMob are leading the charge.

It’s easy to be skeptical about mobile. Among the questions people ask – ”How many people really browse the Internet on their phones?” Well, a surprising answer to this question can be found in this article, “More Football Fans Hit ESPN’s Mobile Site Than Its PC Pages.”

About 32 million people in the U.S. access the mobile Web on a monthly basis, and ESPN has 9 million of them, [Ed] Erhardt said. “We’re seeing better than 200% growth year over year for our mobile usage,” he said, although it’s off a lower base. By comparison, ESPN.com’s NFL content is up an average of 36% year over year, with 47.3 million page views, or 41% of all traffic, coming in the 24 hours beginning Mondays at noon. Game-time NFL content is up 43%, and fantasy football up 48%, the network said. According to ComScore, ESPN had 22.2 million unique visitors in November.

Those are some statistics that almost anyone can easily recignize as significant — they speak volumes. ESPN.com has been one of the Internet’s most popular sites for a decade. No doubt, the traffic is there.

And so are the ad impressions, with AdMob, for example, boasting of more than 2 billion ads served each month. Millennial Media provides very specific targeting options including demographic, contnet channels, carriers, geography, and even behavioral. And Mobile Posse provides one of the slickest delivery methods and actually makes mobile ads cool and useful (think mobile coupons, for example).

So, still have doubts?