Fun: Urban Dead

If you're feeling a little bored, try Urban Dead. It's an online massive multiplayer where you are a survivor of the zombie apocalypse. Or one of the zombies. You play it through your web browser via a scripting language. Currently I'm the latter, largely because I chose the wrong class to start with (fireman or scout are good choices if you want to live). Scouts get you into buildings. Firemen have an axe so you can't ever run out of ammo.