The Boston Globe's pictorial feature The Big Picture keeps delivering! This time it's the Sun.
That picture, taken by the STEREO spacecraft, shows the Moon transiting the Sun (and I liked it so much it was part of my Top Ten Astronomy Pictures of 2007), and is part of a jaw-dropping video.
The other images of the Sun posted at The Big Picture are just as incredible. Sunspots, flares, coronal mass ejections pummeling comets... do yourself a BIG favor, and go check them out.