I did a little 4th grade math over at Computerworld this morning. If Apple has distributed a billion applications and sold 37 million iPhones and iPod touches, that means that each device has an average of 27 apps. Knowing people who haven’t installed any apps, as well as some who’ve filled their device up, there is a wide variance. But what it does mean is that iPhone and iPod touch have a stickiness to them that might prove stickier that the original iPod platform with its AAC files. Read more at Computerworld.