Well, it gets better. I've made this kind of chocolate cake - once out of desperation - only to find it was a great idea to substitute mayo for butter. I was about to pass on the video and recipe until I saw the cool update Bon Appetit came up with to create one awesome presentation: a chocolate collar to wrap around the cake.
Here's the new cookbook and already discounted at Amazon:

Ready for Dessert: My Best Recipes by David Lebovitz
Review from Bon Appetit: Trained as a baker in France and Belgium, Lebovitz spent 12 years in the pastry department at Chez Panisse (his strongest baking influence was Lindsey Shere, founding pastry chef of the restaurant). He has authored three cookbooks including Room for Dessert and The Perfect Scoop. The Paris-based baker also writes an award-winning blog, davidlebovitz.com, where he shares recipes, cooking tips, and his picks for culinary experiences in La Ville-Lumiere.
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Here's the demo on how easy it is to dress up a holiday cake or use this chocolate collar band on this cake: