Pac-Man and Dig Dug.
The two games have some neat additional functionality, such as the ability to track stats and achievements on your Facebook profile. Sadly, the games can't be played in-browser -- it requires a small download to play. Even sadder: It's not free. Bumping the game up from a trial version to full version costs $9.99. We'll stick to our honesty box assaults -- anonymously hurting people's feelings is free, and far more satisfying.