I don't believe what you are asking for exists, at least wirelessly. As mentioned the 360 or PS3 is the closest your going to get (I currently use Playon to watch Netflix and Hulu through mine)
However, it sounds like you just want to use your TV as a computer monitor. While you can't do it wirelessly, if your TV is close enough it should be simple enough. If your TV has a VGA input, you can just run the cable from your computer to your TV. Or if you don't, you might need a videocard with the appropriate hookups. I am not familiar enough if there is a VGA to component cable or something like that, but regardless, it shouldn't be that hard to use the TV as a monitor. Might want to stroll over to the HTPC (Home Theater PC) section.