Apple has officially opened the App Store for iPhone and iPod touch applications. In an interview with the New York Times, Apple CEO Steve Jobs revealed that 25% of the first 500 applications available on the store are free, and of the commercial applications, 90% are selling for $9.99 or less. In addition, a third of all the initial applications are games. “The reaction we have gotten so far has been really strong,” Jobs said. “The quality…