First,
I am loving the numista site. Over the last two years I have slowly added my coin collection and have found it a great place to find information about world coins and keep track of my collection.
One feature request for Excel export would be for the valuation of the coin to be exported. I know the values are not always right, but it would at least help with knowing which coins in your collection are the most valuable. Also, it would be great if there were some way to sort or search by this.
Thanks and keep up the great work!