Today I entered the wonderful world of this MMORPG through free unlimited trial and was really excited with it. Though I'm not sure that I'd drop my WoW group (yes group, not guild - we play as a kinda party of 5 and prefer to percive all the rest as NPCs of the sort :)) I've certainly felt the great atmosphere of the game.
More than that - I wanted to make my players in my 4E campagns feel the same. So after thinking it over I thought it was about tiny details which speak loads about the world outside the current place of adventuring - ships in the harbor, exotic clothes, tavern tales, legends, bard songs and so on.
Now I'm thinking about doing it on the tabletop. Will get back to it later.