The Daily Grind: What's your favorite post-launch feature?

Single-player games can occasionally get major DLC or expansions to change the face of the game, but for the most part MMOs are the field where a game can change between two patches. Champions Online recently made a major change with the addition of hideouts, adding in a form of housing to the game that hadn't existed at all when the game launched. It's a recent example, but it's hardly the only time that a game or a expansion has gone live and later had a major addition to its features list.

Sometimes features are added in shortly after launch as promised features not quite ready at the time the game went gold, but far more frequently an entirely new feature is developed and added. So what's your favorite feature that was introduced after the game's launch? A player-generated content system a la City of Heroes or Star Trek Online? The addition of instanced PvP such as World of Warcraft's Battlegrounds? Let us know!

Every morning, the Massively bloggers probe the minds of their readers with deep, thought-provoking questions about that most serious of topics: massively online gaming. We crave your opinions, so grab your caffeinated beverage of choice and chime in on today's Daily Grind!
This article was originally published on Massively.