NASA's Solar System Exploration: Multimedia: Our Top 10

I think my favorite is the 10,000 galaxies and the story behind the image. This is a great image for your desktop wallpaper. When you think things are stressful, just look at one of those points of light and consider that it is an entire galaxie full of stars, and that from where we sit, this picture is a magnification of just one tiny fragment of "empty" sky.
NASA's top 10 images