Check out a book titled "Caffeine Blues", by Stephen Cherniske, M.S.. (Barnes&Noble or Borders should have it...and you can sit down and read it for free there!) The book goes into quite a bit of detail about the psychophysiology of caffeine addiction and withdrawal, and also makes specific recommendations for supplements, & explains the rationale for each. (ginseng, 5-htp, b-vitamins, ginkgo, etc....) While quitting caffeine was still hell to go through, the book did help me a bit. Good luck!!