Today is Pi Day, a day celebrated by mathematicians, scientists and geeks due to it being 3.14 (March 14th). The number Pi is about 3.1415926535 and thus on March 14th, it is celebrated as a special day every year.
Google had a special Pi Day logo last year but not this year. Here is a picture of the logo from last year.

The picture above is our theme for Pi Day 2011.
Google also did not have a logo for the 2009 Pi Day event.
I should also add it was Einsten's birthday today. He was born today in 1879, 132 years ago - yes, on Pi Day.
Forum discussion at Search Engine Roundtable Forums and Google Web Search Help.


Comments:
gabriel
03/14/2011 12:06 pm
lol, I hope google comes up with something new.. lets see
Betty Hansen
03/14/2011 12:41 pm
For all the geeks and nerds on this page.
Betty Hansen
03/14/2011 12:42 pm
For all geeks and nerds everywhere. Supporters of Pi arise!
ILGoogleLogos
03/14/2011 01:30 pm
How can Google not have a logo for Pi Day? That was the first thing I looked for when I turned on my computer. Come on Google do something for all of us that celebrate this day!
Joyrgoodman
03/14/2011 02:39 pm
happy pi day everybody !:)
Happyday
03/14/2011 02:42 pm
i know
Mark G
03/14/2011 03:16 pm
Dissappointed. There is still time to change it.....suggest they do it at 1:59 pm....
Bob
03/14/2011 08:18 pm
rah
Tabbatha Cavendish
03/14/2011 11:59 pm
Thank you for putting it up! Today is my birthday and I am proud that it is on PI and that I share it with Einstein!!! Tabby :)