At the Apple iPad event today, CEO Tim Cook also announced some milestone numbers. Cook said that Apple has sold 170 million iPads thus far. Cook also said that there 475,000 iPad-optimized apps on the App Store. The Apple iPad usage now accounts for 81% all tablet usage. This is four times than other devices.
Cook also revealed that iTunes Radio now has 20 million listeners. iTunes Radio was launched on September 18th. Around 1 billion songs have been listened to so far. iTunes Radio is currently only available in the U.S.
Justin Timberlake was the first artist to premiere an album on iTunes Radio. Timberlake debuted the album 20/20 Experience Part 2 on iTunes Radio.
iTunes Radio is free with ads or $24.99 per year with no ads. Custom radio stations can be created. iTunes Radio also works on iOS devices.