I recently found a game I remember foundly. Gazillionare from LavaMind. I admit, it is a simple and mindless game, but it can suck you in. Though I don't remember when I originally found it or began playing it, I know it was a long time ago. Today I discovered that they have been continuing development of the game (though probably minamally). It has been re-compiled to work on Vista and they have added some additional planets, ships and characters. I encourage you to give it a try. Not a bad way to kill a little time.