I saw this thread and was mildly shocked that anyone would see a need to stop drinking coffee. Diet Dr. Pepper? By all means stop using that unnatural and poisonous blend of chemicals. If you see a need to reduce caffeine then cold turkey is most definitely not the answer. Taper it off slowly by mixing caffeinated coffee with decaf, Excedrin will cure the headaches almost immediately, it contains caffeine.
My own oppinion is that cigarettes spoiled the taste of my coffee for all those years, if you find your coffee doesn't taste quite right, buy better coffee. The stuff you were drinking was probably crap anyway. If you can't afford better coffee then get a better brewing system. Those 'coffeemakers' on everyones counter produce crap coffee even if the beans are of fairly high quality and recently roasted.
Look into a French Press Pot, it brews better coffee and takes up a lot less space. It's just a tiny glass and steel pot, you put the coffee in, pour in the hot water, stir and wait a minute while it brews. Then press the coffee grounds to the bottom with the plunger and pour.
[B]My Milage:[/B]
[B]My Quit Date: [/B]8/17/2007
[B]Smoke-Free Days:[/B] 212
[B]Cigarettes Not Smoked:[/B] 5,088
[B]Amount Saved:[/B] $890.40
[B]Life Gained:[/B]
[B]Days:[/B] 38 [B]Hrs:[/B] 21 [B]Mins:[/B] 28 [B]Seconds:[/B] 2