iPod I wouldve enjoyed...

[Must.Get.nano!]

I wouldve enjoyed the see the iTunes counter continue. To get an idea of when the next billion would be

 

[calebjohnston]

To get to 1 billion that it was at the other day, it took 3 years. Factor in how fast the company is growing along with iTunes' popularity, I'd say 2.25 years it'll get another billion.