We have already featured quite a few Apple TV hacks here at Geeky Gadgets, although this one lets you play videos on your Mac using AirPlay.
The Mac AirPlay hack was created by Erica Sadun from TUAW, and it will basically let you play videos on your Mac from your iPhone or iPad using AirPlay, you can see it in action in the video below.
You can find out full details of how to do this yourself over at TUAW, and there is a free app that is available to download to get it working.