The official site of the January 20, 2009, inaugural ceremonies gives information on events, history, how to get tickets, how to request to particpate in the inaugural parade, photos, and more. Sign up for the inaugural e-mail list to receive updates.
Items of special interest include:
What Happens on Inauguration Day
Chronology of inaugural ceremonies for all presidents
Facts and Firsts
“I Do Solemnly Swear”: A Half Century of Inaugural Images (from the U.S. Senate Curator)