Server and Group Overlay: Number showing how many people are in Voice Calls

For those of us who like to be in VC as much as possible, how about a small overlay over the server pic on left,

It would be just like the existing one that  tells you how many pings you have from a server.  

This one will report the number of people that are currently in Voice Calls (VCs).  It could sit to the left of the existing one and be a different color, like Yellow or Green, with a small number over it, reporting up to 999 users (3 digits wide)