Miranda......
You might be interested in this book: The Anatomy of Stretching, by Brad Walker. (http://www.amazon.com/Anatomy-Stretc.../dp/1556435967)
I'm incredibly tight from the neck down from too much time at the computer for work, plus cycling. I do yoga, but decided recently that I really wanted to learn more about stretching---particularly stretches that target neck, shoulder and back pain. So far, I'm finding Walker's book to be a huge help, in part because the detailed drawings highlight which muscles are getting stretched. There's probably a lot of similar info for free on the Internet, but I like having it all between two covers and well-illustrated. Walker even tells you which stretches are most useful for which sports.
Good luck! I'll be interested to hear what some of our veteran TE'ers have to suggest to help you out.