++ While I also tend to use CDNs it’s important to note some things: 1) it puts you at the mercy of someone else’s outages and it’s possibly a remote network so it shouldn’t be part of anything meant to be bulletproof or things like bundled webapps that might run in a VPN or intranet with no external access, 2) use Google’s, not jQuery’s or others unless it’s all there is (Google is more reliable, faster, and more likely to be in someone’s cache already), and 3) schemeless URIs are a best practice; so I say. :P