AirParrot is an interesting piece of software that allows you to view content from your Mac desktop through your television set if you have an Apple TV that can act as a bridge between the two devices. Read more about AirParrot.
Connecting a tablet to a computer connected to a projector
Check out Reflector from airsquirrels.com. I’ve used them off and on for years to cast my ipad to desktops (and then display to the projector.).
Source: about 3 years ago
