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Why get up to get a coffee while coding (blogging, IM'ing etc). A disposable keyboard would include caffeine in a key-cap coating, so that you could absorb it through your fingertips. Or just the letter "e" or the spacebar to limit the absorbtion, and waste. Then you could just pop off the "e" cap and
get a freshly brewed cap when you need it. Hey - how about an iced-cap for those hot days!
Smokers looking to kick the habit could have a nicotine key-cap as well. They could gradually move down the alphabetic frequency map to wean themselves. Ending up at the x or the z perhaps before stopping it all together.