Freely available database of British parliamentary debates. Based on information from Hansard, the Official Report of debates in Parliament. There's Hansard itself; by volume, just the Lords sittings, Commons sittings or Westminster Hall sittings. You can also view Written Answers, Written Statements, Lords reports or Grand Committee reports. There are also lists of People who are recorded as having spoken, Constituencies, Offices, Acts, Bills and Divisions.

Electronic documents made available by the Dudley Knox Library at the Naval Postgraduate School, searchable by keyword or by topic, including general U.S. policy documents, national strategy documents, theses and research papers from the Center for Homeland Defense and Security and the Naval Postgraduate School, and homeland security executive orders. Also includes notices of events and conferences pertaining to homeland security, and news items drawn from various news sources.

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Published by the United States department of State, the FRUS series is the official documentary historical record of major U.S. foreign policy decisions that have been declassified and edited for publication. It is an excellent resource for studying US International Relations. The volumes are easily browsed by year and topic. They are also available online.
For more recent volumes: http://consort.library.denison.edu/record=b3786844~S6

From the Office of the Historian. These are easily downloadable and searchable.

The Congressional online public access information system. Provides access to full-text legislation, public laws, the Congressional Record, committee reports, roll call votes, floor activities, committee schedules, selected historical documents, etc.

From the University of California, Santa Barbara, this resource includes primary documents as well as media.