But why?

http://www.google.com.hk/logos/white_logo-276x110.gif

[title changed ~ hebbet]

maybe earthquake?
http://www.google.com/relief/qinghaiearthquake/

Yes but that was last week on Thursday.

And it doesn't trigger any link. Odd.

WebSonic.nl: In fact earlier:
http://earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2010vacp/

Got a statement from Google:

"From time to time we show a special colorless logo on our homepage in recognition of a current loss or tragedy. Users in Poland recently saw this muted logo, and now we're showing the logo to users in China and Hong Kong to pay our respects to the victims of the Qinghai Earthquake. We are saddened by the loss of life and great damage caused by this natural disaster, and our thoughts are with the people of Qinghai, China."

It is national day of mourning for the quake victims in China. Public entertainment would also be suspended Wednesday,

Juha, thanks, didn't know, but it was for the earthquake. Got the same statement as Barry.