A post on /. asked why Mars Spirit wasn't sending back any night photos showing off Phobos and Deimos. I was intrigued enough to go investigate, and quickly found out why. According to the Phobos size comparisons page that NASA has, Phobos, the larger of the two Mars moons, is .006 times the diameter of our Moon. Deimos is .004 times the diamter of our Moon. The NASA page lets you view virtual size comparisons, and at first I thought it was broken because all I saw was an image of the Moon. I then realized that Deimos was the white pixel in the corner.

It also turns out that there are photos of the Phobos and Deimos that were taken by Pathfinder. They aren't particulary interesting, though there are some nice photos of Phobos taken by the Mars Global Surveyor.
- Phobos Photos
- Deimos Photo