http://www.google.gr/logos/2010/marathon10-hpc.jpg

This doodle triggers search

http://www.google.gr/search?q=%CE%BC%CE%AC%CF%87%CE%B7+%CF%84%CE%BF%CF%85+%CE%9C%CE%B1%CF%81%CE%B1%CE%B8%CF%8E%CE%BD%CE%B1&ct=marathon10-hpc&oi=ddle

and gives more information via the first hit on Wikipedia.