Donor Tools now supports Amazon Simple Pay! 

As long as you specify your IPN URL, Donor Tools "just works" with Simple Pay. You can put the donate now button on your own website, or you can optionally copy and paste the button code into your Donor Tools public profile page. When a donation is received through Simple Pay, Amazon Payments notifies your Donor Tools account, and the new donation is recorded. 

Setting up Amazon Simple Pay is really easy with Donor Tools. This video shows you just how to do it. 

Setting up Amazon Simple Pay with Donor Tools from Ryan Heneise on Vimeo.