The foundation of any great fashionable wardrobe is definitely shoes. Shoes can make or break an outfit, so you've got to have just the right pair. Though they have a wide range of products, Zappos.com is best known for their shoe selection. Whether you're looking for athletic shoes or designer heels, they've got it. And now this shopping experience is literally at your fingertips, thanks to the Zappos app, which is available to Droid, iPhone, and iPad users. Just like the Zappos Web site, the app lets you browse according to brand or search by shoe type; you can also access your Zappos account through either the app or the Web site. But beware -- the ease of shopping through the Zappos app can make shoes hazardous to the health of your bank account [source: Appolicious].