Here's a handy, if not a little gimicky,
map tool that shows where Web 2.0 innovation is taking place in the world.
The map, which you can navigate and zoom around, shows a list of what it considers to be Web 2.0 sites per continent, country and city. It makes for interesting reading. The lists of Web 2.0 sites are compiled from various blogs and sites, including Web 2.0 Central and Techcrunch.