According to a March estimate from Distimo, there were 653,614 apps in the iPhone, Android, iPad, BlackBerry, and Windows Mobile stores alone. So, is it any wonder that these busy people have found a few that come in handy on the job? Mobile apps are as indispensable to district IT executives as they are becoming in the classroom--for professional and personal reasons--and everybody seems to have their favorites. In this article, IT leaders share the programs they use over and over again to save time, money, and motion on their job.