The App Store just reached a major new milestone, as it served its 10 billionth app earlier today. For the occasion, the lucky iOS user who downloaded the 10 billionth app from the store will receive a $10,000 iTunes gift card. The milestone was hit about 5 hours ago, around 4 AM Central Time. The App Store hit the 1 billion mark in April 2009, less than a year after its launch. Less than two years later, the App Store served ten times more apps to iOS-powered users hungry for games, utilities, and eBooks.