Poking around, I've found new articles from a few years back talking about a study using mice that showed caffeine may help with Alzheimer's disease.  This article at the London Times is dated today, but I don't know if it's referring to a new study, or the older one (possibly with new analysis of the results).  In any event, the study showed that in mice with the rodent equivalent of Alzheimer's, a daily dose of caffeine not only halted the progression of the disease but actually reversed it to a degree.

The dose was equivalent to about 500mg in humans, or about six shots of espresso.  The nice thing is that, even if it doesn't pan out, folks can try it out anyway as caffeine is currently legally available in many forms and its effects are pretty well understood.

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