Make smarter organization charts with Visio
http://office.microsoft.com/en-us/visio-help/make-smarter-organization-charts-with-visio-HA001077462.aspx#BMtipshandlinglarge
** Lots of great tips **
Even as you create an up-to-the-minute organization chart today, you know it will be obsolete tomorrow. But you can set up your organization charts so they are fast and easy to revise.