In-app billing is now live for Android. In-app billing allows developers to sell virtual goods or even upgrades from within their own apps. As an example, one of the apps that launched with in-app billing is Tap Tap Revenge. In this case, users will now have the ability to purchase extra songs.

In-app billing gives developers additional methods to monetize which is great for the consumer because more developers will create their magic for Android. [Android Developers]

There are several other apps that are now taking advantage of in-app billing:

Comics by ComiXology,
Gun Bros by Glu Mobile
Deer Hunter Challenge HD by Glu Mobile
WSOP3 by Glu Mobile
Dungeon Defenders: FW Deluxe by Trendy Entertainment

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