Angry Birds has just hit half a billion downloads. That's 500,000,000 downloads from official app markets such as the Android Market and the Apple Appstore, it does not include the ones which get copied or downloaded from unofficial places.
Angry Birds isn't just available on mobile however. It's available on the Chrome WebStore, the Playstation Store and other markets.
It's become the #1 game in 79 countries, over 266 billion levels have been played, over 400 billion birds have been shot, over 44 billion stars have been collected, people have played over 200,000 years worth and over 300 million minutes played daily. Now those statistics will blow many games out of the water.
I remember seeing somewhere that Angry Birds was making Rovio $1 million a month from Android alone.