iTunes Radio: 2 Billion Songs, 20 Million Users Since September Launch

Just over a month after it's September 18th launch, iTunes Radio users have listened to more than i billion songs, Apple announced today.  More than 20 million people have checked out the service.  The numbers are particularly impressive given that iTunes Radio is currently only available in the U.S. More stats from Apple today:

• Apple's app store has delivered 60 billion cumulative downloads.
• $3 billion paid to developers to date
• 9 million iPhones were sold in one weekend after the 5c and 5s launched – the biggest iPhone launch in history
• the company allso launched a new line of lighter, faster iPads – the iPad Air