Ryan Kaldari wrote:

BTW, here's an extremely basic working prototype if anyone's curious (doesn't work in Explorer due to lack of SVG support): http://toolserver.org/~kaldari/maps/prototype/

I would love to collaborate on this if anyone else is interested (and knows a fair bit about SVG).

I was thinking about making this, and I believe it would be the best to generalize this approach. For example, a parser could pass through a SVG file and pull out all the classes used; then the user would select which classes should be colored in what color.