If you were asked "Hey, what's the fastest selling portable gaming system?" what would you guess? Nintendo DS? PSP perhaps? Well, you'd be dead wrong. The iPhone 4 has officially received the honor of claiming such a title by the Guinness Book of World Records.

It's hard to believe that we've come this far in technology. A smartphone -- something that wasn't very smart just a few years ago -- is actually not only qualified as a portable gaming system, but the fastest selling one in history. iPhone 4 sold approximately 1.5 million units on the first day of availability, according to sales estimates. On the other hand, the PSP only sold a comparably depressing 200,000 units on the first day. The Nintendo DS sold 600,000 in the first week.

This news is quite obviously because of the immense success of the app store. There's tons of productivity apps and social networking apps and weird-as-hell apps and apps that can do just about everything you want. One third of those apps are games. That means there are over 100,000 games in the iOS App Store. By these numbers, this also means that iOS has more gaming titles available than any other platform.

Yes, make no mistake my friends. This is just the beginning of the death of dedicated portable gaming systems and the rise of smartphones that will take their place.

via TUAW