This is an awesome project that the New York Times undertook, I only wish I had known about it BEFORE the event rather than after.
It's a mosaic of photos and where they were taken across the Earth and Mars on May 2, 2010 at 15:00 UTC. Be aware there are _thousands_ of photos and it take a bit to load. Don't try this over dialup.
And the blog post from The Planetary Society about the Rover Opportunity's contribution to the Moment in Time Project.
Please, take a few minutes to look through the photos. Some are quite stunning in their subject. You could spend all day looking and not see everything.
Thanks to @TaviGreiner for retweeting it from @Exoplanetology ! Follow them on Twitter!