Connect old Cinema Display (24") as 2nd Display to newest iMac? I'm considering buying a new 27" iMac (current model sold now).  I still have a 24" Cinema display (mini display port) that I currently have connected to an older iMac.

Now I'm wondering if this will work on the Thunderbolt socket.
There is no reason why it shouldn't. TB has the same connector that mini display port. So you won't even need an adapter.