I found these games by "riding" on the Internet Tour Bus.
First Spaced Penguin I have already shared this link with one LJ friend and she declared the game evil. (I have a feeling anyone who thought that web laser game was evil will think this one evil too.)
And a blast from the past, Midway Games. If you're around my age, and visited an arcade in your youth you'll remember these games. The web page even gives you free virtual quarters to play the games, so you don't need to buy tokens either! (oh, one word of advice, if anyone besides me uses the Dvorak layout for your keyboard you might want to switch back to Qwerty to make sure you are pressing the correct keyboard controls for some of the games)