I put this here because it is a full OS not only that but, it is more of a project also it's not just a regular OS. It is made for home theater PCs, media center computers, and set-top boxes. You can make a media center computer that connects to your HDTV and streams all kinds of web content and I'm sure you could hook up your cable/dish and record TV with the right video card and setup.
Not only that but you can control it from an Android phone!
What is Element OS?
Element is a free operating system for home theater PCs, media center computers, and set-top boxes. Featuring an innovative "across the room" interface designed to be connected to your HDTV for a digital media and internet experience from within the comforts of your own living room or lounge. Element comes loaded with the software needed to stream all forms of web content and manage your own multimedia library and downloads. We've included many popular open source applications, each adapted to our unique interface, such as the Firefox Web Browser, Pidgin Messenger, and XBMC Media Center, along with access to numerous on-line content services from Hulu, Cooliris, Boxee, Clicker, Amazon on Demand, Youtube XL, and more.
http://www.elementmypc.com/main/index.phpCheck it out and if you have a spare PC laying around and some spare time maybe you could have the ultimate media setup.