Every day, Google is show casing a different Google Doodle (logo) on their home page for the olympics. We've been archiving the logos in this post, so if you want to catch up on them you can.
Today there is a more robust Google logo up for the hurdles even. It is an interactive logo that you can race your friends and share the results on Google+. Here is a video of my poor performance:
Here is a static image of the logo:
Yesterday there were some complaints that Google didn't have a special logo for the landing of the Curiosity rover on Mars. Truth is, Google did incorporate that in their logo yesterday, as Google Aygul points out in the Google Web Search Help thread with this picture:
Aygul from Google wrote:
Google's doodle today honored the rover by placing a drawing of it above a javelin thrower in the Olympics. The doodle originally featured just the javelin thrower with a blimp above him, but updated to include Curiosity.