Google’s Android operating system has undergone a pretty incredible metamorphosis in the three short years since it debuted on the T-Mobile G1. Think about it: three years, eight major releases. Eight.
To put that in perspective, there have only been ten major consumer-grade releases of Windows (give or take, depending on how you count) in over twenty-five years of retail availability.
You could make a pretty convincing argument that no consumer technology in history has evolved as quickly as the smartphone, and Android has been at the very center of that evolution.
The Verge has updated their visual history of android to include Jelly Bean, interesting reading to see how far it has come.