Fourmilab Switzerland
John Walker: Named Lunar Formations
This atlas of the Lunar surface features lists all named features. Click on a name and see an image of that item, or at least an image of the Moon centered on that item.
Nine Planets
The Nine Planets: The Moon
Explore the mythology, structure, observational history, gravitational force, and orbit of Earth's Moon.
Other
Mas: Lunar Photography With Telephoto Lenses
Ever taken a picture of a nice large full Moon, only to find that it looks like a small dot on your finished photograph? This site explains why, and offers tips on taking good pictures of the Moon.
NASA
Nasa Space Science Data Archive: Russian Lunar Missions
Details the Russian lunar missions from Luna 1 to Zond 8.
NASA
Nasa Space Science Data Archive: Lunar Exploration Timeline
Available in both HTML and Shockwave formats, this site is a visual timeline of US, Soviet, and Japanese Lunar exploration. Each point of the timeline links to text information about that spacecraft and mission.
Other
The Apollo Society: The Solar System
Contains a small set of images of solar system objects and a series of links to information about all solar system objects. Solar System Tours link to excellent image collections.
Quia
Quia: Luna and Beyond (Quiz)
A series of questions about the moons of our Solar System is presented in a millionaire game format.