The Sunlight Foundation launched a beta version of Scout today, a free service which compiles information from a variety of sources to let you search through bills and speeches before Congress, State bills, and Federal regulations. The site allows the creation of custom alerts when a specific issue is going before Congress, as well as tracking these issues over time.
The Sunlight Foundation is a a non-profit who "uses the power of the Internet to catalyze greater government openness and transparency, and provides new tools and resources for media and citizens, alike." Sounds like powerful stuff. You can see more of their work at Sunlight Labs, Sunlight Reporting Group, Sunlight Live and the Open House Project.