On April 23 the App Store reached 1 billion downloads. On Monday, the App Store for the iPhone and iPod touch served more than 2 billion downloads of software, with a half-billion in the last quarter. There are more than 85,000 applications available to more than 50 million iPhone and iPod touch customers.

As the total number of iPhone and iPod touch users continues to grow, the rate at which applications are downloaded continues to accelerate. The App Store has seen an average of 4.5 million downloads per day. In the last 80 days alone, that total has accelerated to nearly 6.3 million each day.

“The rate of App Store downloads continues to accelerate with users downloading a staggering two billion apps in just over a year, including more than half a billion apps this quarter alone,” said Steve Jobs, Apple’s CEO. “The App Store has reinvented what you can do with a mobile handheld device, and our users are clearly loving it.”