Cool, but there are similar projects out there. E.g. http://cdn-cloud.appspot.com/ http://cdn-cloud.appspot.com/ Not sure that response times from app engine a

Cool, but there are similar projects out there. E.g. http://cdn-cloud.appspot.com/ http://cdn-cloud.appspot.com/ Not sure that response times from app engine are that nippy compared to a 'proper' CDN. What would be cool would automatically distributing images via google's image serving CDN. You can use the get_serving_url method in app engine to return a CDN enabled url for any image in the blobstore. Its super fast and allows dynamic image resizing.