The Presidency

Official Websites
The Official Presidential website will be changing shortly as power transfers to the Obama Administration. The site typically houses news and information from the President's Office as well as the Vice President's Office, press briefings, Proclamations and Executive Orders.
The official site of the Office of the President-Elect focuses on the Obama/Biden Administration transition into the White House.
President-Elect Barack Obama's official campaign website lets you view his position on issues, get involved in grassroots politics, and connect with other Obama supporters.

The Inauguration

The Official Inaugural Website
This website from the Joint Committee on Inaugural Ceremonies has everything you need to know about 2009's inaugural events, from what you can and can't bring and how to get there to the complete program of events.
Inaugural Addresses
via the Avalon Project (1789 to 2001)
via the American Presidency Project (1789 to present - many have audio and video available as well)
Inaugural Quiz!
Test your knowledge of inaugural trivia with this quiz from the National Archives.

Presidents Past

Portraits of the Presidents
Portraits of Presidents along with cursory analysis of the strengths and weaknesses of their administrations are provided by the National Portrait Gallery.
Portraits of the Presidents and First Ladies
These Portraits are from the Library of Congress' American Memory Collection.
The American Presidency Project
Brought to you from UC at Santa Barbara, this website contains all inaugural addresses, State of the Union addresses, Public Papers of the President, Weekly Compilation of Presidential Documents, press conference transcripts, and more.
The American Presidency - a Glorious Burden
This website accompanies a traveling exhibition from the Smithsonian National Museum of American History.

The White House

The White House Guidebook
This online book from the White House Historical Association describes the various rooms in the White House along with their history. Includes photos.
Oval Office History
This history of the room that has come to symbolize the American Presidency includes photographs and artists renderings of past decor and other trivia. Courtesy of the White House Museum.
White House Historical Association
This site hosts lots of information on the White House and its occupants.

Presidential Documents

A Compilation of the Messages and Papers of the Presidents
via Project Gutenberg (browseable 1787-1902)
via the American Presidency Project (searchable 1789-1913)
via the American Presidency Project (searchable from 1929 to 1993)
Weekly Compilation of Presidential Documents
via GPO Access (searchable from 1993 forward)
via the American Presidency Project (searchable from 1993 forward)
State of the Union Addresses
via GPO Access (1992 to present)
via the American Presidency Project (browseable 1790 to Present)
Executive Orders
via the American Presidency Project (1826 forward)
via the Federal Register in GPO Access (1994 forward)
Presidential Proclamations
via the American Presidency Project (1789 forward)
via the Federal Register in GPO Access (1994 forward)
Codification of Presidential Proclamations and Executive Orders,
via GPO Access (1945-1989)

Presidential Libraries