Check out this article: http://men.webmd.com/features/coffee-new-health-food
"It's also caffeine -- and not coffee, per se -- that makes java a powerful aid in enhancing athletic endurance and performance, says physiologist and longtime coffee researcher Terry Graham, PhD, of the University of Guelph in Canada. So powerful, in fact, that until recently, caffeine in coffee or other forms was deemed a "controlled" substance by the Olympic Games Committee, meaning that it could be consumed only in small, designated amounts by competing athletes."
"In other words, consume enough caffeine -- whether it's from coffee or another source -- and you will likely run faster, last longer and be stronger. What's enough? As little as one cup can offer some benefit, but the real impact comes from at least two mugs, says Graham."
"But the harder you exercise, the more benefit you may get from coffee. 'Unfortunately, where you see the enhancing effects from caffeine is in hard-working athletes, who are able to work longer and somewhat harder,' says Graham, who has studied the effects of caffeine and coffee for nearly two decades."
I'm not neccessarily a big coffee drinker, but I might add it to my morning regimine to see how it works out. I searched the T-Nation forums/articles for articles ont he same subject, but couldn't come up with much.
Hope this sparks a good discussion.