One of the most frustrating parts of traveling abroad can be currency exchange, especially when you feel like you're getting a bad deal on the local currency. Currency differences, like time and other measurements, can be hard to adjust to, and it's easy to feel like you're losing money at every turn when traveling abroad. Dmitry Dragilev, who I've worked with on Web.AppStorm.net articles in the past, is currently on a round-the-world trip, and he just released this new iPhone app to make you feel more certain you're getting a good deal when you're getting your currency exchanged. Just enter the local exchange rate, and the amount you're trying to exchange, and it'll show you what you're really being charged for the exchange.
Yet another handy, focused app that makes your phone the best multipurpose tool ever!