Top aides around Obama are expected to begin work almost as soon as Obama stops speaking.
"I think that is very, very true," ABC News' chief Washington correspondent George Stephanopoulos told "Good Morning America." "They have an agenda set for the first 100 hours of the first 100 days where they want to demonstrate ... they'll hit the ground running."
He said to expect actions "in the first couple of days on issues like stem cell research. ... It means appointing new envoys to hot spots like Iran, Afghanistan and Pakistan to demonstrate a fresh start in foreign policy, as well."
Obama, who has promised change in Washington, is trying to set a bipartisan tone right away. His inauguration celebration includes three dinners this evening to honor people who have reached across the aisle.
Two of those honorees are Republicans, including Sen. John McCain, R-Ariz., the man Obama defeated to become president.
Stephanopoulos told "GMA" the dinner for McCain is a "measure of the bridges they are trying to build. ... That is remarkable."
The other two dinners will salute former Secretary of State Gen. Colin Powell, a Republican, and Biden.
But first, the celebration. A constellation of stars serenaded the Obamas at the Lincoln Memorial Sunday. The lineup, dubbed "Obamastock," included Bono, Bruce Springsteen, Beyonce, and Usher. Comedian Jamie Foxx spoofed Obama by imitating the way he speaks.
Obama has invoked Lincoln repeatedly in the run-up to his swearing-in. He spent much of the weekend on a train retracing part of the route that Lincoln took to Washington for his own inauguration.
As Obama planned out his first steps, President Bush made some of his farewells. He called world leaders, including Russian Prime Minister Vladimir Putin and Italian Prime Minister Silvio Berlusconi, to say goodbye.
Bush plans to fly home to Texas on Air Force One after Obama's swearing-in and has invited about 10 friends to join him and wife Laura for the trip back home.