Here I'd like to pose two suggestions:
-Could it be possible to add a little section about the mint(s) coins are produced at with the general information. Of course the ones with different mint marks are listed, but with some coins it's more complicated than that. They might have been minted in several or different places in different years. This is sometimes put in the "Comments" section, but I think giving it a separate section might look more tidy.
-Could it be possible for a total face value counter (for the top three currencies) on the "My coins" page? I would be really interested to see how much my collection 'is worth' that way.