Although I totally agree that coffee intake is best in moderation, I have to point out two things (both of these recent 'findings' were huge media stories this year):
First, coffee is actually remarkably high in antioxidants. Recent studies show its antioxidants are even more bio-available than those in cocoa and green tea.
Also, high coffee intake has been linked with lower risk of developing type II diabetes (a blood sugar/insulin sensitivity disorder). But it's worth noting that this benefit is only measurable if someone drinks upwards of 8 cups a day! Any less offers no benefit in this regard.
That said, coffee is also brutal on the adrenal glands, and highly acid-forming. It's hard on the digestive system too. Finally, dark roasts in particular are fairly high in acrylamide, a known carcinogen (that's got to have a counterbalancing effect on those wonderful antioxidants).
When drunk black, in moderation, it's fine, but if you drink a lot of it, it's fairly minimal protective benefits will be outweighed by the damage it causes.