Is anyone aware of a script or tool that would allow me to view what users have a paticular mxd open at one time?
We are using ArcGIS Desktop 9.3.1.
I think you have to rely on your file system for this information.
I've used openfiles from the command prompt to get this information from window file shares. You would need admin access to the actual server, so this might not be an option for you.
It used to be called the Job Tracking eXtension (JTX) but now it is called ArcGIS Workflow Manager
This thing does some really cool stuff. However it is a $$ hit.
If you look on the ArcScripts website I think there is a free "mini" mxd utility that does something like this.