Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I play my games and watch my sky football through my USB card plugged in to my MBP. It works well.
 
Some of the EyeTVs have coax inputs, so it not gonna look great, but it'll work :)

EDIT: This one has an S-Video input, which can be converted into a composite input. I think this would be your best solution.
 
Didn't think about the EyeTV solution, but yeah, I'd have to wonder about how good it would look.

Also, there's a lag. I believe that in EyeTV2, with certain Elgato hardware, you can select 'game mode' that minimizes the lag. When not in game mode the lag is so bad (on the order of a second or more) as to make any action games unplayable. Not sure how much 'game mode' improves it.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.