|Answer added on 29/11/2010: Tapulous|
Tapulous Inc. is an American software and video game developer and publisher headquartered in Palo Alto, California. It is a wholly-owned subsidiary of The Walt Disney Company as part of the Disney Interactive Media Group. The company's most profitable products are the Tap Tap series of music games, which has surpassed over thirty-five million downloads.
Tapulous was founded in February 2008 with the specific intention of developing software applications for the iOS platform.