[citation][nom]joytech22[/nom]Sweet Jesus! Finally! Thank you Valve. :3Now all they need to do is support this with their L4D series and TF2.Aaaaand allow a per-player-per-screen scheme for those of us with multiple monitors.[/citation]
I don't think you will see such with TF2 due to the nature of the game not being co-op based. As for L4D 1/2 it is possible to play split screen coop on the PC just takes a little work. http://www.youtube.com/watch?v=Nlp1j9u3T1Y though I don't know if you can play online with others doing this.
[citation][nom]The Lads[/nom]Wtf plays portal 2 with a controller?[/citation]
Some people are just more used to a controller because they have played games on consoles for so long or it works better with the game than a mouse a keyboard (Flying jets in BF3 works better with a controller than the keyboard for me anyway).
That's one of the great things about PC gaming, you get to pick your hardware instead of being forced to one imput method.
Now if Valve could push all games on its Store to "patch" or "update" their games to support Split Screen and perhaps Online-Coop (if included in game) that would officially turn Big Picture into the PC Console. DO IT VALVE! We love you!
Imagine, not needing to pay $240 for 4 copies of Call of Duty: Black Ops 2 just to play 4-players locally. Black Ops 2 should update to support 4-player split screen play, and maybe two-player online co-op. I shouldn't be forced to buy 4 copies of one game now that Big Picture is out.