I recently found a Web 2.0 Innovations Map which is a Google Maps mashup that plots Web 2.0 innovative companies. The map was produced by Ryan Williams of Fourio as it:
"...grew out of an interest in how Web 2.0 development is distributed geographically."
The site provides an email address to send recommendations for additional listings. I just sent Ryan FeedBurner's address in Chicago since they should most definitely be plotted.
Check out Ryan's blog post for additional details.
