[pieter]

I don't see how. The maps used by OpenStreetMap are under a free license, Wikimapia is just proprietary (Google) maps with a bit of user data on top. It's like comparing Wikipedia to Encyclopedia Brittanica with user comments.

[ynniv]

But wikimapia has wiki in the name!

Seriously tho, few people realize that wikimapia data is © wikimapia and you are not permitted to create derivative works except for "personal or educational" use.