This report released back in February of 2010 is one of the better ones written in the last year or two. Bob Hinkle and David Kenny do a good job of covering everything from the basics to the major hurdles facing large commercial (and others) energy efficiency projects.
Obviously the biggest hurdle facing the commercial market is how do landlords pay for or finance large CapEx projects when the split incentive exist between the landlord and the tenants.
Bob worked with Steve Gossett Jr. on the section of the report that covers Transcend Equity's Managed Energy Services Agreement (or MESA).
The CalCEF report uncovers into good detail on six case studies.