People can downplay the actual number of iPhones in circulation all they want — the fact of the matter is that it has changed things. While there were some third-party mobile app developers before Apple’s App Store, they received almost no attention, and as such, it wasn’t really a viable business. Now, everyone and their mother is flocking to develop for the App Store. And every major mobile player is rushing to make their own app stores. But Apple’s already has over 35,000 apps — and in a few short hours, there will have been one billion apps downloaded in just 9 months.

Think about that for a second: One billion apps downloaded. There are currently 37 million iPhones and iPod touches combined. Certainly, there have been a lot less than that over various stages in the last nine months, but just take that 37 million number. That means that every single one of those devices has had an average of 27 apps downloaded to it. 27 apps — that do everything from games to music to movie times to fetching me a taxi.

I remember the phone I had before the iPhone, fondly: Motorola’s RAZR. It had zero third-party apps, and the most exciting thing it could do was take a grainy picture. That was just two years ago.” — MG Siegler (Techcrunch).