Google has finally released in app billing. This will allow users to purchase items from inside of an app like Tap Tap Revenge. There are several other apps that can also use this feature immediately. They are Comics by ComiXology; Gun Bros, Deer Hunter Challenge HD, and WSOP3 by Glu Mobile; and Dungeon Defenders: FW Deluxe by Trendy Entertainment. Other developers can now implement this feature in their own programs.

Posted by Randy Pinneta via Android Developer Blog