It’s been for 10 years and counting, says Google as they posted on their blog:

The Google doodle tradition started a long time ago (in summer 1999, in fact) when Larry and Sergey put a stick figure on the homepage to signify that they were out of the office at Burning Man. Nothing against stick figures, but our logo designs have become rather more varied since then. Today you’ll see a special design that commemorates our 10th birthday. We’ve incorporated a little bit of history by using the original Google logo from 1998. And since everyone keeps asking what we’d like for our birthday (besides cake and party hats) — the first thing we thought of was a nice new server rack.
Well, happy birthday to you and we love you so much :)
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Tags: 10 years, Blog, day, design, google, google doodle, google logo, happy birthday, nothing, page, side, Sign
Comments: 6 comments
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rushi
September 27th, 2008 at 11:39 pm
happy birthday
Glenn
September 27th, 2008 at 11:44 pm
Well happy birthday, we share it, today is also my birthday, when I saw the doodle I thought it was about me.
marian ilie
September 27th, 2008 at 11:48 pm
Happy Birthday my friend ! La multi ani prietene !
Marian Ilie
Daloola
September 28th, 2008 at 12:56 am
HaPpY BIRTHDAY GOOGLE !!!!!!!!!!!!!!!
Daloola
September 28th, 2008 at 12:58 am
4RM YOUR BBF Dalool w chub
Daloola
September 28th, 2008 at 1:03 am
Chubbbbbbbbbbbbbbbbbbbbbbb