Wirelessly connect TV to computer

What do I need to connect my computer to my TV wirelessly?
My computer is a Dell Studio 540 (Windows 7 with Windows Media Center); the TV is a Sony Bravia 40V4100; the router is a Linksys Wireless-N Broadband router. I'm missing something that would connect the TV to the network?

What do I need and how do I do this? :confused

 

There are a few devices that can help. Orb and Slingbox are two. I use Orb, it's alright once you get it set up. You can also use it through other devices like a wifi capable blueray player or Xbox (not sure which one) or I use the Wii. Orb is also fee free.