I work at a studio in the netherlands where we have 5 hd protools systems running, all with the same plug-ins. But we have a few plug-ins which we have only one authorisation on a single iLok, so we can use these plug-ins in every studio. BUT, then you have to disable or enable this plug-ins...
So I had an idea to design an application to switch plug-ins on and off, just like the good old extension manager in macos9. It's still under construction, but I'm very currious what other protoolsusers may think of it... so if you have protools running on a mac (osx10.3.x), download the pt plug-in manager and give it a try:
PT Plug-in Manager Website