PBS
Pbs: American Experience: Answer to Subpoena for Recordings, 1974
Read the complete text of President Nixon's address to the nation in which he responds to the House Judiciary Committee's subpoena for additional presidential tape recordings concerning Watergate.
Other
Gerald R. Ford Presidential Library and Museum: The Watergate Files
Detailed story of the political crimes collectively known as Watergate, as told by the Ford Library. Includes coverage of the trials, the Senate hearings, the tapes, and the people involved.
Independence Hall Association
U.s. History: Undoing a President
A good description of the Watergate affair, what led up to it, who was involved, and why it was such a big deal.