Brains join bowels and skin...

as body parts that thrive with daily caffeine.

French researchers studied 7,000 men and women with respect to their drinking habits and their ability to retain their marbles over the course of 4 years. The men, unfortunately, became tongue-tied and befuddled independent of coffee consumption. But the women, particularly the old gal octogenarians, remained nimble in word-finding and spatial orientation by tossing back three cups daily of the real caffeinated deal.

Per Karen Ritchie of the French National Institute of Medical Research:

The more coffee one drank, the better the effects seemed to be on (women's) memory functioning in particular.

Coffee also seems good for the basal ganglia, a part of the brain that regulates movement. Trouble here causes movement disorders such as Parkinson's Disease and also the abnormal muscle spasms known as dystonia. One form of dystonia is blepharospasm or eyelid twitching. Think Chief Inspector Dreyfus in "The Pink Panther." Coffee consumption inversely relates to risk of Parkinson's (the more you drink, the lower your risk of developing the disorder), and now a study from Italy suggests that daily use will also keep your eyelids still(1).
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Defazio G, et al. J Neurol Neurosurg Psychiatry. 2007 Aug;78(8):877-9.