1) Dark roast coffee has less caffeine and is (in my subjective opinion) tastier. So if one wants the taste of coffee without less of the effects, consider an espresso or a Turkish coffee. The latter is just called "coffee" in much of Eastern Europe, one can pick up a beautiful cezve on Amazon http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3D...
2) Yerba Mate is 75 mg of caffeine per serving: higher than tea, but less than coffee. Can be made in an French Press or a tea pot and served like conventional tea.
3) Caffeine gum: not particularly pleasant to chew, but comes in a more precise dose (100mg) and is "kicks in" faster.
Personally, I'd like to see more genetic studies on this: I am not particularly affected by caffeine: I've never experienced withdrawals (despite consuming caffeine heavily -- from coffee and energy drinks for a long period of time) nor do I see coffee raise itself in potency after a week or two of abstinence. This is different for others and I would really like to understand why.