I'm currently on my second pair. They last forever, are surprisingly comfortable, and even have a bit of arch support. People think the price tag of $50 is crazy, but I say they're worth every penny. My first pair lasted 3 summers of heavy use and my current pair are in their second summer.
America already has flip-flops with bottle openers on the underside. They're a terrible idea though, because you really don't want to open a bottle with the dirtiest part of your shoe.
Notice the bottle opener on the bottom.
http://www.amazon.com/Reef-Mens-Fanning-Flip-Flop/dp/B001PTHDRS