There are many services that track and display Bitcoin exchange rates. One of the easiest apps to use is btcReport (available for iOS on the App Store):

Figure 2.2 - btcReport, a Bitcoin price ticker for the iPhone

The main display of btcReport, as shown in Figure 2.2, shows the latest trading price and news. Daily metrics are shown as changes in today's price (shown on the top), a ticker chart, and the trailing 3-day average (shown under the chart). Displayed along the bottom is a selection of currencies, and on the top right there is an option to change the exchange. btcReport functions nicely as an app in your pocket for a quick glance at the exchange price and recent movements.

For most users who wish to casually buy and sell bitcoin, btcReport offers a clean and uncluttered view into the markets.

The following...