http://www.nasa.gov/home/hqnews/2006/dec/HQ_06361_ESMD_Lunar_Architecture.html
Dec. 4, 2006 RELEASE: 06-361
NASA Unveils Global Exploration Strategy and Lunar Architecture
......the Briefing Charts especially, are very interesting (1.2 MB PDF) :
http://www.nasa.gov/pdf/163896main_Exploration-LAT_Briefing_120406.pdf