Not surprisingly,  a ‘Google Doodle‘ has been created to celebrate the occasion:

The CWI (Centrum Wiskunde & Informatica) in Amsterdam has unveiled a Turing Machine built from LEGO:

LEGO Turing Machine from ecalpemos on Vimeo.

For more information about Alan Turing, widely considered the father of computer science (and the modern computer), start with the Wikipedia article (but don’t stop there).