There's no Org Chart feature like the complex ones that OmniGraffle makes, but they did add a simple Connector Line feature in '09 that is a start:
!http://web.me.com/csyverson/filechute/cl1.png!
You can only select two shapes at a time for the function to work, and you have no real control of the placement of the lines, but at least it's something...
!http://web.me.com/csyverson/filechute/cl2.png!