Going through the Steam forums I read that we'll eventually have functional computers and TVs. If so, that be interesting. I'm as stumped as the developers so I"ll at the very least try some brainstorming to see what could be done.
- TV Wise: Add in some pre-made clips as basics while even accepting .gifs. Allow people to upload .avi files onto their server (host side) so people can watch certain things. It should be up to them how much they should be able to stream while only capping the speed and size to something semi-bandwidth friendly. SP should be fine as it's straight on the computer, though sized down. Loosely thinking GTAO here with how you can view pre-recorded videos.
- Computer wise: Allow for cached bookmarked pages to appear. Something like copying a bookmark into a folder for the game to read, maybe double-check, and even make use of. Even give it the ability to read from the screenshot folders (A seperate option for online servers) to view images. People could place their own images if desired. Can also use .gifs, and maybe even .avi files. Should be able to stream/play music files also. Even .FLAC & .ogg files.
I'm sure you guys shall figure something out. Basically summed up the GMod stuff, and very loosely on the Minecraft mod stuff. It's only a spark in thought.