According to the latest research released by Gartner, worldwide mobile application store download revenue reached $4.2 billion in 2009, a number that is set to grow to $6.2 billion by the end of this year. The research group claims that 2009 saw 2.5 billion app downloads, a number which Engadget used to estimate Apple’s share of the market at roughly 97.5%. Gartner also claims that advertising-sponsored apps will generate nearly a quarter of…
