A small while ago, I had written about David Stanfill (of Napkin Studio) and his work on developing an AirPlay Mirroring receiver for OS X. Work proceeds on that project. At the same time, he is also building a tool that makes live mirroring from your Mac screen to Apple TV.
Called AirParrot, the new app makes it possible for you to select a Mac display and an AirPlay location (typically an Apple TV). It then uses H.264 selection to build a live video stream from your chosen display.
This permits you to perform directly on your laptop or desktop system and mirror it to an HDTV display, just as you would using iOS’s built-in AirPlay mirroring characteristics.
AirParrot is even now in its early days. As yet, there is no subsampling (i.e. you cannot just pick a portion of your screen to mirror) and no audio mirroring. Steadiness can be a bit iffy as well and the developer is still operating on a way to keep the Apple TV from proceeding to sleep while mirroring.
The application is super useful for any person who works in groups or in front of people. If you can live with the early adopter disadvantages, it will well be worth your money. You can generate live slideshows through Keynote and Ms powerpoint, illustrate apps, collaborate with an audience at a corporate conference, and more.
The video below showing it in action from the Apple TV side of things: