Measurement and Verification 101: Meters
I have recently been scouring thought the Pacific Northwest National Labs and EERE websites regarding metering and I am impressed with these resources. Specifically, there are three free webinars that you can play on-demand along with other more detailed design guides that you can read that will give you a good background in the types of meters that are out there and what can/should be used. Even though these webinars are geared toward EPACT compliance they still apply to other buildings as well. The following link will get you to the page for the webinars so you can see for yourself.
If you have other resources that you use go ahead and share them.