If you have read my post on iMac 2011, you would have know that iMac 2011 now have thunderbolt port, and 27 inch have 2 of them! So it means that we can now have 2 external monitor, and have a 3 monitor setup! Pretty cool right? Not only that, iMac 2011 is fast enough to support 3 concurrently playing 1080p video on 3 different monitor. How I wish I can get this 3 monitor setup!
Check out the below video, iMac 2011 27 inch supports 2 external monitor via thunderbolt: