Shocking! All chocolate is not created equal!
Some of the comments are interesting, though, especially the ones from serious chocolate aficionados. Someone suggested eating cocoa nibs. I second that suggestion. Regardless of their health benefits, they are delicious. However, they are also pricey. If anyone wants to get me a nice gift for my birthday (July 3), I would adore some cocoa nibs, preferably hechshered and fair trade. (I'm not sure nibs require kosher certification. I think they might just be raw crushed cocoa beans.)
You can also get flavanols from red wine (yum!) and tea. I really only drink herbal tea, so that probably wouldn't work for me. Apples, onions, and broccoli are apparently high in flavanols, too.
More on eating and foods to come... I have many thoughts in that department.