I see some good sites writing in its footers that it's hosted on Amazon S3. So do anyone using that service and how about pricing and speed? Thank you. P/S: Ah, can I run a PHP/MySQL script on it?
S3 is too expensive if your website use too much bandwidth. Better go for other brand CDN. Yes you can use PHP/MySQL script on it.
It can be very expensive, I've looked into the pricing for a couple of projects and never gone ahead due to this. But it depends what your requirements are!