I’ve commented several times over the last year or more that what would be REALLY useful is a site that searches all the gift card secondary marketplaces for the best deal.

And finally today we have Cardnap, which does exactly that.  As the blog Lifehacker reports:

Cardnap’s primary function is to report on the best discounts, and the best selling prices, at gift card swapping spots like Plastic Jungle, Cardpool, and others. Type in a store name, browse through the discounted offerings, or hit the Sell section to see how much you can get for your remaining Cheesecake Factory balance. Free to use, the site claims no affiliation with any of the sites it scans, and there’s a handy balance checker you can use for any card.