I've added a coin value calculator, in the table showing the last fetched data. You can enter an amount per crypto-currency and it calculates the total value in dollar, euro or pound and at the bottom shows a total of all coins.

The amount is stored in a cookie (named mycoins) and the value calculations are done client side through JavaScript. (Note that cookies are automatically sent to the server with every request, they are ignored on the server though)

I thought this would be a nice way to keep an eye on the potential value of the coins I have.