Twenty-two months ago, in June of 2010, I made a note to myself indicating that I would like to buy a wireless keyboard that has a built-in track pad so that I could control a computer connected to a TV monitor from the couch. Now it's here!
It's Bigger IRL
The ideal solution in my mind is to have one unit that has a full-sized keyboard with the same kind of track pad that you find on every laptop computer attached. That way moving the device won't tell your computer to hold everything because you moved the mouse, you're not going to lose it between the couch cushions and you can use it to manipulate your computer a lot more effectively from the couch by just using a wireless mouse.
Aside from the benefit of being able to hook up my computer to my TV to watch internet based video, it's also nice to see how well, or how poorly (I'm looking at your Bing with your images that don't scale up on a large monitor) websites look when viewed on a large monitor. Being able to pause a movie when the mood strikes to band out a bit of typing is also a really nice feature.