The contradictory stories of coffee always bothered me.  Is it beneficial, or harmful?  I guess it depends on how you look at the facts. One of the main key is to consume in moderation.

Some Facts

It is full of antioxidants - around 1,000 organic compounds in the coffee beans.
There's evidents that suggest it greatly reduces your chances of developing type 2 diabetes. Regular consumption has also shown to reduce your risk profile for stroke, Parkinson's Disease, dementia, heart arrhythmia's, breast cancer, prostate cancer, colorectal cancer, Alzheimer's and cardiovascular disease. 

However, caffeine in coffee is a natural situmulant that can cause jitteriness, profuse sweating, and heart palpitations.  Coffee can act as a diuretic and can reduce the body's supply of potassium.

Bottomline - you make your own personal choice.

Additional peer info - 
1. A cup of black coffee may have the same effect as an inhaler to stop an asthma attack.
2. Chew on a coffee bean to help your bad breath go away, better than breath mints. Yes even works on garlic breath (from Ethiopia).
3. Use coffee grounds as a skin exofoliate, cure for dry skin. There's no need to purchase expensive creams. Store used coffee grounds in a container with lid, in the bathroom.  Use all over the body, including face. It is full of antioxidants and it will not clog up your drain.  It's a great cure for cellulite as well.

Reference:
http://www.earthclinic.com/Remedies/coffee-health-benefits-side-effects.html