In DC, WABA (Washington Area Bicyclist Association | Advocacy and Education in the Washington Area) distributes a Pocket Guide to Washington DC Bike Laws, which appears to be nicely sized for either a, well, pocket, or an under-the-saddle pack. Every law mentioned in the booklet has Section/Title numbers. There's even a "Common Enforcement Errors" chapter which lists things police officers commonly cite incorrectly.

Think I'm going to start bringing this pocket guide with me every time I ride in DC proper.