>A couple more easily available resources:
>
>Visio Professional
>EverGreen's EasyER
>ERWin
>Visual Modeler

note... Visual Modeler doesnt do data diagrams, ERWin does I think (memory serves to say ERWin is the more expensive competitor to xCase), I dont know about EverGreen, and Visio Pro only does data in version 5.o or later