From the Sunlight Foundation:
Databases: Library Of Unified Information Sources (LOUIS) (Beta)
The Library Of Unified Information Sources is a project of the Sunlight Foundation, and an effort, to paraphrase Justice Louis Brandeis, to illuminate the workings of the federal government. The ultimate goal is to create a comprehensive, completely indexed and cross-referenced depository of federal documents from the executive and legislative branches of government. These documents are organized in a user-friendly interface, with a powerful search engine.
You can search broadly for keywords or limit searches to a single document set or range of dates. LOUIS, which daily updates its document depository, even allows you to set up a “standing query” as an RSS feed. LOUIS can alert you every time there is a new document that references your query. For example, if you want to follow “lobbying reform,” and Senators debate the lobbying reform measures of an ethics bill, the LOUIS notifier feed will send an update with a link to the relevant transcript from the Congressional Record.
Sources Currently in LOUIS Database:
Seven sets of federal documents:
Congressional Reports
Congressional Record
Congressional Hearings
Federal Register
Presidential Documents
GAO Reports
Congressional Bills & Resolutions