The amount of dust accumulation on the moon is very small. After several billion years, the thickness of the dust is still quite thin on the lunar surface. If you've had a significant number of micrometeroid impacts in the area then the dust might be thicker on your equipment.

As for the condition of the Apollo equipment, I speculated on that in a post to Nick above.

A Lunar LDEF sounds like a good idea to me. They learned a lot from the Earth orbiting LDEF back in the 1980s, and the lunar environment is more harsh than LEO.

While the exact details need to be determined, we could possibly land a spacecraft on the moon and leave it there for a year. The spacecraft could open up and expose a number of materials samples to the lunar environment for a time, say a year. The samples would then be returned to the Earth for examination. You might even be able to achieve a twofer by returning some samples of lunar soil and/or possible ice if you landed in the right place. A simple robotic drill could take a plug of the soil and add it to the materials for examination.

This needs to be done in time to allow for materials selection before the hardware design is finished, perhaps within the next few years. If it isn't launched by about 2010, there wouldn't be much point because the designs would be finalized.