That didn't take long. Shortly after the Apple TV was successfully jailbroken, someone has gotten Plex up and running. For now, it's quite buggy (see a video after the break) and limited to video, which means no photos or music. But hey, it's running!
Plex is a media center for the Mac, and pulls content from several online sources, like Netflix, Hulu and Major League Baseball as well as local iTunes and iPhoto libraries.
About a week ago, we saw a 3rd party app for the jailbroken Apple TV that displayed the weather. Let us say good work to the industrious folks who are getting this done.