Eberron

While I'm mostly a fan of the Forgotten Realms, I do like Eberron. I love the trains, the Shifters, and the City of Sharn. There were also a number of pretty good fantasy detective novels done for the setting, which I believe are not discontinued, which is a shame. The drow in the setting are really cool, with their scorpion focus and tattoos. Too bad the Dark Continent was one actually explored in some detail in a setting book. It got the Sembia effect, where it was supposed to be left largely to the DM, but instead, got a couple hundred pages of info.