Okay, this online game is just a ton of fun. It's called Desktop Tower Defense. You basically build these attack towers and try and defend against waves of various types of enemies. I'm not so good at it yet, but so far I'm addicted. Also, at least for me, the game is highly re-playable.
Once you make a decent enough score, enter your name and put your score into the group BruteForceX. This way, we can can all compete a bit.
Note to WOMPER: You've got to play this and crush it, since I know that you're the real gamer among all of us.