Interesting project. My first thought was: Great, changelogs! But then I started thinking a bit deeper and realized that what I'd love to see happen (on a related note) is a site/repository where you can see not only the legislation but the relevant case law over time.
The perfect match might be my friend Mike's awesome and free open source project: He's improving it all the time and would welcome contribution: http://courtlistener.com
It originated as a graduate school project of his at the UC Berkeley School of Information.
