Dec 9: Deadline for states to settle issues such as recounts or challenges.

Dec 15: Electoral College electors meet in each state to formally cast their votes for the next president.

Jan 3: The 111th session of Congress begins.

Jan 6: Joint session of Congress to count Electoral College votes.

Jan 20: Inauguration day. President George W. Bush retains full constitutional authority until noon, when Mr Barack Obama is sworn in.

BBC