Today, of course, marks the transition of power in Washington. At 9am this morning, President Obama took the oath of office, making him the 44th President of the United States. Several million people attended the event, making it perhaps the largest political gathering in American history.  Here are a few of the notable events which occured today:

Most awkward oath of office in decades -- Volokh Conspiracy (discussing the "gaffe" Chief Justice Roberts made during the oath)

Who was President while Perlman fiddled? -- PrawfsBlog (very interesting constitutional discussion about the ten minute gap following the end of Bush's administration, but before the oath occured)

Bush Street renamed -- SFist.com (a light-hearted article about residents who changed the name of "Bush Street" to "Obama Street" in San Francisco for the inauguration)

Update 1/21/09: It appears that the crowds at Obama's inauguration did not in fact surpass a record.  Based on satellite photos of the crowd, initial estimates range from one million to one and a half million.  This is lower than the crowd gathered for LBJ's inauguration in 1965.