Over the next few days we'll be building out the site with more information about the upcoming ShmooCon lobbying trip as well as our feature roadmap. The short version is that we'll be pulling the entire United States Code into darcs, updating it via GovTrack's APIs, and providing a UI to select and fork specific sections of the law for people to collaboratively work on.
The site's going to change quickly in the coming weeks as we add more functionality. Maybe we shouldn't have launched quite this early, but there is a bit of a time crunch.
Edit: IAC, if you're interested in more DVCS-like, offline/command-line functionality, I'm totally down to support that. Tell me more about how you'd expect to interact with that?
Out of curiosity, did this come out of the aaronsw Hackathon at Noisebridge this weekend?
[wish i had been able to make it there, but was unable]
It sort of dovetailed with the aaronsw Noisebridge hackathon, but we started hacking on it independently about a day before. Christie, who's a Noisebridge member, realised the hackathon would be a good place to present it, and did. Via that, we met the http://hypothes.is/ guys, and things have continued to snowball from there :)
We're actually partial to darcs for this particular use case (the patch model is closer to how laws are actually amended), which ironically may decrease traction on the command-line since everyone has such a hard-on for git these days. IIRC you can use darcs via git, though.