[Silent Assasin]

I have used Slingbox for years with great results. Orb is also an option, but make sure your card is compatible with streaming tv, via Orb. Some cards are not compatible. I would suggest going to their forum and seeing what cards have been successful.
Slingbox for me has been great because unlike Orb, the computer does not have to be on to stream video. Orb requires the computer to be on and Orb running in the background.