Do the right thing and just sign up for Amazon's CDN CloudFront:
http://aws.amazon.com/cloudfront/
Don't waste your time looking at bullshit services or taking advice from randoms. Just go with the best and be done with it...
Edit: Figured my post might be taken the wrong way and people would then start to argue whether or not they thought CloudFront was the "best". And, so I wanted to add - if that's what the takeaway you got from my post you didn't get my point.