Add to 
David Bloom found an interesting hidden URL which takes you back to 2001 Google Homepage.
Try to visit www.google.com/intl/// and it will take you back to 2001
It shows ?Google Searching - 1,610,476,000 web pages? (This was eventually removed from Google Homepage because Yahoo challenged against it)
Alternatively you can see more older Google Homepage here (Archive.org - Way Back Machine)
Via Google Blogoscoped
[tags]Google, Google Homepage, Archive[/tags]
Written by 
wrote, on November 27th, 2007
http://www.google.com/intl/ does not show up anything now.