The iPhone stocks seemed like the most useless of the default apps supplied until a colleague showed how you can get exchange rates as well as share prices.
Add a new "stock" by tapping the "i" (bottom right) then "+" (top left) and then search for a stock code made up of the two three-letter currency codes followed by =X. For example UK Sterling to US Dollar is GBPUSD=X, then exit gracefully back to the main screen.
iPhone stocks currency rates
What I only discovered by accident was that turning the iPhone sideways gives you the full screen version of the chart:
iPhone stocks currency rates graph
For a list of the currency codes see http://www.xe.com/iso4217.php
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