"The Quarterly iPass Mobile Workforce Report reveals the behaviors of mobile employees, and identifies common characteristics to segment users into five categories: mobile minimalists, mobile minority, mobile majority, mobile masters, and mobile maniacs. The iPass Mobile Workforce Survey conducted as part of the report asked mobile employees what technologies provided a gain or a drain to their productivity, how often they were checking their smartphones during downtime, how often they worked from home, and if mobility influenced their work/life balance."
Check it out: http://www3.ipass.com/wp-content/uploads/2010/05/Mobile-Workforce-Report-052010.pdf