The use you are describing for GAE doesn’t actually make it anything like a CDN as you correctly define it initially. What you describe from GAE is just free file hosting. I would suggest if people are looking for a real CDN solution they look at Amazon’s CloudFront: http://aws.amazon.com/cloudfront/ CloudFront isn’t free but it is pretty cheap.
The use you are describing for GAE doesn’t actually make it anything like a CDN as you correctly define it initially. What you describe from GAE is just free file hosting. I would suggest if people are looking for a real CDN solution they look at Amazon’s CloudFront: http://aws.amazon.com/cloudfront/ CloudFront isn’t free but it is pretty cheap.