Hey, we just launched the public beta our internet tv channel for user-generated content YUR.tv. If you don't care about the content, you can at least watch our servers die
The site is mod_perl based using our internal MVC and ORM frameworks. Most of the UI is composed from JSON - webservices so you are free to build your own front ends if you don't mind reverse engineering the protocol for now (until we add docs)
One thing that is really special about this site is that we give away shares of the publicly held company behind the project for good content. So everyone gets to be a part of the (potential) success of the site.