NASA's Aqua satellite took this incredible shot of the Iceland volcano Garvenblagentralfamadoran (pronounced "Eyjafjalajökull") on May 10, 2010:

I know I've posted several of these, but this is my favorite; we can actually see the ground in this one, instead of clouds and ice. You can also trace the plume from the volcano for hundreds of kilometers as well, showing just why this event is making such a mess of things in Europe. NASA's Earth Observatory Picture of the Day is a must-see for anyone interested in these incredibly images coming from space.