Funny that they included the amount of catechins in black tea in their example! Further down in the article, it says that green tea has between 28 and 42 mg of catechins per cup. It's my understanding that amount of catechins varies depending on quality and age of the tea, so you need a good quality, fresh, loose leaf green tea to get the most benefit. Better yet would be white tea, which can contain as much as 5 times the antioxidants of green tea!
As far as the metabolic properties of green tea, it isn't as much as we'd like to see, lol. Studies have shown that if you drink 4 cups of good quality green tea every day, that you can burn 8 pounds of fat - in a year
Chocolate, of course, would be the tastiest way to get antioxidants
It's also part of the Poly Diet, which is not necessarily a weight loss diet, but a live longer and healthier diet.