CFED, formerly the Corporation for Enterprise Development, has released its 2007 Development Report Card for the states. Idaho ranks favorably in many areas, including energy costs, patents issued, and charitable giving. But we are near the bottom of the barrel in other areas including - no surprise here - urban mass transit, for which we rank a dismal #47.
During 2004, the last year measured, Idaho's mass transit systems traveled 1.27 miles per every Idahoan for the entire year. Contrast that with Washington state, which ranked 3rd in the nation with 20.43 miles per capita, and Utah, which ranked 12th with 12.25. New York was tops with 35.81 miles traveled per capita. See the rest of the rankings here.
CFED includes mass transit in its listing of infrastructure resources, noting "The extent of mass transit availability is an important measure of workforce mobility and overall transportation capacity."