If you visit Google.com today, you will see a special logo for Dr. Seuss’s birthday. The logo’s alternative text tag reads, “Happy Birthday Dr. Seuss! Courtesy of Dr. Seuss Enterprises.” Here is a copy of that logo:
Clicking on the logo will take you to a search result set for Dr Seuss including web results, news results, image results and more.
I couldn’t find any other search engine celebrating the day, but PPC Heros, a PPC blog, did make a special logo for the day.