The cupcakes look good, and based on the reviews of the cookbook - taste good too.
You can watch some of their cooking shows on Google Video.
From the Amazon description of the book -
"Isa Chandra Moskowitz has been cooking up trouble in Brooklyn since the '80s. The author of Vegan with a Vengeance, she has done vegan cooking demonstrations around the country and has been featured in many print and online publications, including Bust, Herbivore, Gothamist.com, and more. Since 2003, she and Terry Hope Romero have hosted the public access/podcast vegan cooking show Post Punk Kitchen, filmed in Isa's apartment. Along the way, they have baked thousands of cupcakes."
I generally tend to shy away from vegan baked goods that attempt to mimic baked goods made with eggs, butter, cream - because I believe there is simply no way to duplicate those ingredients. I'm pretty sure you won't be able to make a puff pastry or croissant with vegan ingredients - cupcakes maybe - pancakes, brownies, bars and pies certainly. I'm not a big fan of recipes that require buying high priced vegan substitute ingredients in special stores. If the cookbook uses pretty basic ingredients I can buy at a regular grocery store, and maybe a few things from a whole foods store, that would be good.