Open-source US- state status display

I was wondering if anyone knew of an Open-source project for displaying numbers for the US states.

Specifically, you always see these graphics with California in dark grey, Montana in green, etc. Based on some sort of criteria.

I'm thinking of building one for a site I maintain, but I was hoping I might not have to reinvent the wheel.

http://upload.wikimedia.org/wikipedia/commons/7/70/World_map_of_Energy_consumption_1979-1981.svg

Something like the above, but for the US, and you can define your own criteria?

From stackoverflow

• Try the maps in the Google Charts API. You can select countries and colors programmatically.

  altCognito : Not open source.

• This is about the best I could find specifically in open source.

  I would take a plugin like this just change it to do "highlighting" based on your dynamic data:

  • http://plugins.jquery.com/project/maphilight

  • Demo of plugin: http://davidlynch.org/js/maphilight/docs/demo_usa.html

  Currently it highlights on mouseover, but highlighting using data given should be very straightforward.

  The fact it comes with a map of the US and highlighting ready to go set is just gravy.