Well, it finally happened. Apple just delivered its 1 Billionth application download from the App Store, which currently features over 25,000 apps (35,000 by one estimate) built by thousands of developers. The significance of the milestone (besides just the 1 billion mark) is that it's taken only nine months from when the App Store launched on iTunes to hit 1 billion paid and unpaid downloads. Last summer, Apple sold one million 3G iPhones worldwide across 21 countries in the first 3 days on sale. During that same time, iPhone users made 10 million app downloads from the then newly launched iTunes App Store. The count was at 200 million in early December, and the App Store hit 500 million downloads by January 19th. It took Apple six months to reach the first 500 million downloads. It would take Apple only 95 days to get another 500 billion downloads. By March, 2009, it was at 800 million . We started keeping track via Apple's billion-app countdown at around 928,077,779. Apple also offered us a fleeting glimpse of the most popular apps ever, something the company only did once before.