YouTube was by far the most popular web site in the US in January reports PC Advisor.

In January it had 66.2 million unique visitors and 2.6 billion videos were watched.

Other video sources:

                                    # Unique Visitors    # Videos Watched

Fox (My Space)                      19m                   377m

Yahoo                                   22m                   299m

Google Video                          13m                     79m

That is a total of 3.35 billion clips watched by 120 million unique visitors (Note: Unique Visitots maybe shared across platforms)