There’s an app for everything, or so it seems. So it shouldn’t come as a surprise that Apple has a high chance of passing the 500,000 app milestone for the App Store in 2011, based on current data. They have already unofficially passed 325,000 active titles as of December 26, with the App Store seeing about 25,421 apps submitted per month.
That means that if every app were approved, Apple could exceed the half-million point in just seven months or so. Of course what with app rejections, titles voluntarily pulled from the store etc, it might take a bit longer. Whenever it actually hits, it is quite a milestone.