New research suggests the global appetite for mobile applications will explode over the next two years.A study done for Getjar, the world's second biggest app store, said the market will grow to 17.5 billion dollars in the next two years. The study claimed downloads would climb from 7 billion last year to 50 billion by 2012 – a 92 per cent year-on-year increase. It found there had been a gold rush with the number of app stores rising from four before 2008 to 48 today. The study also suggests Apple's domination of the market could be challenged. While Apple's App Store is regarded as the dominant player, there are many more to choose from including those from BlackBerry, Microsoft, Google, Nokia, and Samsung.