If you want a game that's as fun as it is second-nature to any computer user, you ought to look at Simple Word Search. The game is no-frills: just you, a window, and a ton of words to find on a randomly-generated board full of them. The game lets you customize the difficulty including the dictionaries used, and the whole family can play it - even the kids!
Simple Word Search is fun for everyone, and simply annihilates those long hours at work.