First to clarify. You can add any currency you want. I added Mexico and Croatia and got rid of most of the default ones (Click the green tools button).
Secondly, there is a clear button. It is a big "x" up in the display area rather than on the keypad.
I found that it took a few tries to get used to the system from controlling the direction of the conversion: are you converting 1 dollar to pesos or 1 peso to dollars. It is very clear after you type the value because each field is labeled, but the first few times I had the conversion backward. A button to easily switch direction might be nice.
Finally, an iPad version that didn't just pixel-double the iPhone version would be nice. Doesn't need to be fancy. Just a bigger display of the same interface and support for rotating the display.
It is a keeper.
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