Has an MMO ever implemented your idea?

Earlier this month, Massively's MJ sat down with the City of Steam devs and discovered that you, the Massively readers, had actually influenced one of the game mechanics. Wrote MJ,

There is one new feature that was put into game specifically because of Massively fans: jumping! That's right. You made it clear you wanted jumping in game, and the devs listened. Who says you don't have the power to change things?

Leaving aside the implication that we spent one of our precious wishes on jumping, I thought this was really cool, and I tried to think of other examples of players coming up with amazing (or not) design ideas that were subsequently implemented in a game. I can think of certain demands that were met in classic MMOs. World of Warcraft is infamous for implementing the most popular player mods as official features, and in more recent news, there are Guild Wars 2's efforts to split reset times for different continents after much player protest.

How about you? Has an MMO ever implemented your idea or the ideas of a fellow player?

TH