AirPlay technology is being widely used by many people between their Apple TV and their iOS devices, but unfortunately the support on Mac is not anywhere near what we all want.
What AirParrot does is equip our Mac with AirPlay capacity, so now we can send exactly the same image that we see on the screen of it to an Apple TV, something that is really interesting for example to make presentations, but obviously there are many more uses, it all depends on what comes to mind.
It is a paid application, but if you are going to use it intensively, I think that the ten dollars it costs will pay off quickly.
Link | AirParrot
Source | TUAW