I’ve been working at home with my new company DigitalHarmonyGames.  I picked up a 2nd 23in monitor adding to my work Macbook Pro 17in I now have a triple monitor setup.  I have Unity3d running on one external, MonoDevelop on the other external and I do mail, skype and web surfing on the Laptop screen.  The 2nd external monitor was made possible by the $50 Cirago USB Display Adapter.  The USB adapter works great.  As long as I don’t run full-screen video or run anything that is too demanding on the usb connected monitor the setup works perfectly.