Basically, you have to buy a SlingBox. That device gets hooked up to your home network and must be near your set top box. From there, you can watch and control your TV from ANY computer. Add the Windows Mobile SlingPlayer ($30 or so) and you can watch TV from your Moto Q. I had the original SlingBox and wasn't too happy with it. I recently picked up the SlingBox Pro and it's been great. The Pro also supports HDTV setups, but you need a SlingBox dongle (add $50). No choppiness or buffering issues. Works perfectly on my Q. I was dragged out yesterday to go shopping w/ my wife. While she was roaming Banana Republic, I was outside on my Q watching the Yankees game.
SlingBox Pro $225
Sling Box Dongle $50
Trial version of SlingBox Mobile $0
Watching a Yankees game while my wife is shopping $Priceless
BTW, I'm using it with an HR10-250 DirecTivo.
Extended battery would be a good idea if you invest in this setup.
-Chris