I thought I'd be able to find information on this topic, but it appears my google-fu is weak today. I'm building a Silverlight app that is consuming the Amazon.com product advertising API. I want to add authentication to my app, but instead of using the default forms base authentication, I would like to implement OpenId. I see many sights that use Yahoo, or Google, for their provider. And I do remember at least one sight, but don't remember which sight it was, that used Amazon.com as the provider.
If someone can point me in the right direction on documentation for this, that would be great.
EDIT: I remember now that it was Target.com that allows you to use an Amazon.com login.