We were impressed with the full-color photographs, and found the glossary in French-English of beloved French pastries quite helpful. There is a zoom-able map feature that will help you locate your afternoon chocolate shop from the front stoop of your hotel, and for the type-A planners (myself included in this bunch) there's a page to store your favorite addresses and spots so you can organize where you'd like to go next or note places you really fell in love with.
We've come to trust David Lebovitz as a french pastry expert through his blog and chocolate/pastry tours, so hearing the fact that he visited each shop himself and vetted out the truly charming and delicious from the ho-hum tourist traps makes us trust him even further. For those folks who like to plan travel around chocolate and ice cream shops and have even the smallest desire to visit Paris anytime soon, this one is indispensable.
If you don't have an iphone, Lebovitz assures readers that an e-book will be coming out soon with identical information. And because most folks will probably carry a smaller device around the city, he decided to limit the app to the iphone for now. Updates will be free for the life of the app.