This one's about as unnofficial as it gets, but Linux users do now have a relatively easy way to receive and play video streamed to their PC via Apple's AirPlay. To get things going, all you have to do is download a plug-in for the Totem media player (which ships with most popular Linux distributions), install it in the usual Linux fashion, and then start streaming video to your Linux PC with AirPlay just as if it were an Apple TV. That's it. Hit up the link below to find the plug-in, along with some more detailed installation instructions if you need them.