Just to warn you, what you may be about to download is highly addictive.
One of my favourite time-killer games of the past year or two has been Fairway Solitaire. I paid $10 for it a while back and have more than got my money out of it, but now the company that makes it is giving it away for free.
It's a fantastic combination of solitaire on the computer and golf. And it's free.
Don't say I didn't warn you.