Cisco has an ongoing initiative to track and forecast the impact of visual networking applications on global networks. Their current paper presents some of Cisco’s major global mobile data traffic projections and growth trends. Highlights include:
Last year’s mobile data traffic was eight times the size of the entire global Internet in 2000
Smartphones represent only 12 percent of total global handsets in use today, but they represent over 82 percent of total global handset traffic
By the end of 2012, the number of mobile-connected devices will exceed the number of people on earth.
You can find more information here.