Now that in-app purchasing for free apps has been live for a few weeks in the iTunes App Store, and Apple is now ranking the top-grossing apps, whether they start out as free or paid, we have some initial data on what kinds of apps are pulling in the most money from in-app purchases. (In-app purchases allow apps to offer a free version and then make money by requiring consumers to pay for additional features or content). Today, Distimo put out a report (download it here) which breaks down the top 40 grossing in-app purchasing titles by category (see chart below). Games, social networking, and book apps are doing the best job upselling consumers from free apps to paid enhancements. Music, news, and finance apps, not so much.

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