https://bitk.in - Spend bitcoins at Amazon.com. Unlike other sites, you can put the actual amount of your order at Amazon, so you're not left with change at the end of the transaction.
Let me know what you think. Also, if you're interested in being an affiliate, or have ideas for integration. Specifically someone with greasemonkey experience that could write a program that swipes the checkout amount from amazon, pops an overlay, wiats for the gift code response, and stuffs it into the checkout form would be sweet.