Apple's iPhone

By 2010, the total number of images captured on camera phones will reach 228 billion, according to InfoTrends, exceeding the number of photos taken on digital still cameras and film cameras combined. But back in 2002, the idea of sticking a little lens into a phone was novel. It has caught on so quickly that nearly every new phone has a built-in camera, and the number of digital images captured worldwide has grown from under 40 billion in 2002 to nearly 200 billion in 2005, according to Lyra Research.

By Jeremy Caplan and Brendan Lowe