Wikimapia is a new map website borrowing Google mapping technology. Wikimapia revolutionary goes beyond Google by allowing users to collaboratively define their own comments to places they know to the global map.
I have tried to defined a lot of known places for my hometown Nha Trang, Vietnam here.
Some of the comments I read for Nha Trang are hilarious. Like this one is concerning the 4 Seasons Coffee shop: "4 Seasons Coffee shop: expensive, bad taste, don't go there".
And there are even some pretty close to profanity like "Yen Phi Park: has more whores than people"
I'm sure it does have detail map for places like Hongkong and Taiwan too.