Superfoods - Which are beneficial? Which are just hype?

There is so much talk lately about Super-foods, those foods which purport to have medicinal (or better) properties.  The site Information is beautiful ranked all the purpoted superfoods; from Garlic to Green Tea to Acai to Walnuts and and interactivly graphs them.

The higher up on the chart the better the evidence for the super-food.  The more to the right the higher amounts of medicinal benefits.  You can filter the results for any number of categories, heart health, aging, cancer, cardio, weight control, etc.  Very interesting...

Super-food Chart: