Google has another special logo (doodle) today. It's not a logo just for today, but a review of all the doodles for the year. Google changes its logo regularly for special occasions like holidays and birthdays of prominent people in history.
Going to www.google.com today you will see the special logo. Move your mouse over the image and you will see many links. When you click on them they go to logos that have appeared at different times during the year.
You can see Google's doodles at www.google.com/doodles. There you can see all of this year's logos as well as previous years. There are quite a few as they have been doing doodles since August 30, 1998 when they did a logo about the Burning Man Festival.