Nifty as Sharn's world concept is, it's gotta go.
As for those of you considering Lankhmar just because you don't know about it... Boo!
Actually, Lankhmar's a pretty cool city. One of the notable things about the 1e/2e map for it were the "blank" central areas of certain city blocks--in the sourcebook, you wer eprovided with geomorphs so that way, you could pick whatever back-alley street layout you wished (and, of course, it could easily change, if need be, due to fire, construction, etc.).
And, of course, there's the novel-based niftiness of the place: the Street of the Gods, the Bazaar of the Bizarre, the massive Thieves' Guild, Lankhmar Below & its rat denizens, the Plaza of Dark Delights, etc.
In a way (IMHO) it was Greyhawk before Greyhawk.
