Here's a suggestion for the nice people at USGB / GBCI: for international projects using the SI system (International System of Units- metric system), it would be great to have LEED Reference Guide version using SI, as ASHRAE does. That would be a great help for both contractors and consultants.
A step beyond that would be to have this version translated into Spanish. That would accelerate the use of LEED in Spanish-speaking countries. Adios!