I made brownies a few days ago with both a new recipe, and a new cocoa powder. I'd previously been using the Scharffen Berger unsweetened cocoa. However, I couldn't find it in the store, and I bought and used the Green & Black's Organic Cocoa Powder instead. Not only is it organic, but it's also fair trade! I was blown away by the results. The brownies came out much richer, with a great chocolate flavor, and a little bit of bitterness that counteracted the richness. And judging from the leftovers, everyone else seemed to enjoy them too!
I also love their teas.
And here's the brownie recipe I used. If you're on a diet, don't look!