Article on the LSAM in the latest issue of Air and Space Smithsonian online:

http://www.airandspacemagazine.com/ASM/Mag/Index/2006/AM/soap.html

To quote:

One piece that will be especially useful to leave on the moon is the LSAM's airlock, which represents one of the most significant improvements over the Apollo LM. The moonwalkers of the 1960s struggled with the fine, powdery dust that covered their spacesuits. Back inside their tiny one-room cabin, it got everywhere-in the machinery, in their eyes, in their throats.

Scott said that moon dust even got in the connectors between the backpack and the spacesuits."You could almost hear them grind after three days," he said. He ranks dust as "the major problem for a long stay."