I spent some time in Hangzhou (near Shanghai) last year, and remember asking around about online maps -- none of the usual suspects like Google had anything for China at the time. Everyone pointed me at the edushi.com (which means "e-city" in Mandarin) and it truly amazed me the first time I saw it! It reminded me of the Sim City scenarios that were based around real cities.. All of the buildings are modeled quite accurately, even individual trees and small landscaping details are represented. I guess that's what happens when labour is cheap and there are lots of aspiring art students without many good job prospects. :)

(The company behind the maps, Aladdin Information Technology, is based in Hangzhou. I can't wait until they expand to non-Chinese cities around the world!)