So what does this mean? Simply that you can now install the Tiger versions of Boxee or XBMC (for Mac) on your Apple TV. First you use need to use Davilla's handy atvusb-creator on your Mac to convert a USB flash drive into a patchstick. Then you just need to plug it into your Apple TV, wait for the patch process to complete, and install either Boxee or XBMC from within the plugin. In the end you get an Apple TV with all the extra functions of XBMC or Boxee including much broader codec support, the social networking features, etc.
The atvusb-creator is a free download from Google Code for Intel Macs. To use Boxee, however, you'll need to request an account at their site.