Alexa.coms rankings of popular websites, never terribly accurate but always debated and used in arguments, have dropped Google from their number 2 spot all the way to #4. Passing Google.com are Googles own YouTube, now #2, and Microsofts Live.com, now #3. Heres Alexas traffic graphs of the top five sites:

Alexas data is based on installations of its toolbar, which skews it to a particular and not always representative audience. However, the audience would tend not to use YouTube or Live.com as much as the general population, which makes this graph all the more interesting. While Google isnt dropping, its competitors are recording significant gains, and Google may need to watch its back (or front, depending on who you believe).

Del.icio.us

Digg

Reddit

Furl