Cards and Deck Database seems to group all the editions together and shows the price of the latest non-foil version of the card. This means that you can't do such things as sorting cards by their foil prices (ie. one of the more expensive foils in Innistrad is Delver of Secrets, even though it's not that expensive as a non-foil) or finding the most expensive basic land.

If I'm looking to add a card to a deck it's more useful this way but in-so-far as a general price guide goes it's not so useful.

Maybe a new option can be added under Cards and Deck Database? ie. Magic the Gathering Price Guides or something?