We use RRs and $vbphrases for images and client script.
We are also just about finished with a PHP script that monitors the CDN's performance and if it falls short of our expectations, automatically changes the DNS A records to a different server. Then, when the CDN is performing well again, it switches back.
I am considering adding a backup CDN so when SimpleCDN hiccups, which is does sometimes, our system will automatically switch over to the second one, which is more expensive. Then, when SimpleCDN is performing again, we switch back to save money.
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