I would love to be able to see thumbnail images of 'on hold' sessions so that if something needed my attention, I could move there and work on it immediately.
Right now, I have to guess when I should check back in to a particular session.
I have to place my current session on hold, head back to IE, find my Host tab, join the other session, wait for the connection etc etc. After all this I might find that Im not needed there yet (maybe a scan hasnt completed) and so I have to reverse out and do the same thing again to reconnect to my original session. Its a bit cumbersome and very inefficient.
Decent sized thumbnails of screen activity on all sessions would make life much better and I could see at a glance where to go and who needed my attention.

I would be good for this only if it were for Attended sessions. The reason being, it would be necessitate the software grabbing screencaps ever _X_ seconds/minutes and that's not something I would want happening with an Unattended (since the software doesn't know if I'm done with that session or not). Were it an Attended session and I've left it open, it could be assumed that I intend to reconnect to that system soon.