First, Thanks for a great plug-in.
I wanted a simple "now chatting" widget so I could list who was currently active in my Quick Chat chat room. I didn't see any existing way to do this, so I made a very rough pass at it based on the existing bundled Quick Chat plugin.
I've posted it as a plugin here:
See it in underwhelming action in the right side sidebar here:
If this is of interest to anyone else I'll try to clean it up a bit since it's an ugly nest of hard-coded variables in its current form.