If you visit Google today, you will see this image:
Happy 40th Anniversary! Sesame Street
But that's not all.
If you visit Google in the UK today, you will see this:
Happy 20th Anniversary! Wallace and Gromit
More Google country sites are also honoring Sesame Street:
After checking the list of Google foreign language servers, that appears to be all of the different logos. Some country sites don't have a special logo, others use one of the above Sesame Street logos, and still others have the Wallace & Gromit logo.
Saturday 11/7 & Sunday 11/8:
Monday 11/9 evening:
4 months ago