Of all the Halloween events to take place in online games, I feel confident in saying that Team Fortress 2 is among the best at celebrating All Hallows' Eve. It's easily my personal favorite, at any rate. This year's plans haven't been announced yet, but Valve says it's "working on it."
To get us ready, there's a new comic called Grave Matters that reminds me of a ghostly take on Trading Places. It's got the issues that matter most to ghosts.