I know there a number of people looking to be able to view the cameras display on external screens.
Rather than purchasing two small screens I have bought a Hauppauge 558 PCI Video Capture Card.
I am using two Canon A480's, the AV cables will go into the Hauppauge card and display both camera's input on the computer.
When the card arrives I will do some testing and post pictures.
There are also usb video capture cards available for people with laptops.