In-Game Auction

What about an ingame auction.
Just a fusion between a storage and a trader, where you can depose an item you want to get rid and other players can look at the auction and buy stuf.
Now you not have to shout in every town and disctrict.
When a nother player has bought something from you, you get a message/pm that your item is sold and you are able to get your money.

Already been said.

... a thousand times.

Seriously, this is by far the most frequently suggested improvement to the game.

ANet plan to offer something in this department, but it will probably be an exclusive feature of Campaign 3. :/

...or four..or..