The problem however, is that google can be a bit unstable on mainland China, so I'm wondering if anyone know similar things done in China? Maybe Baidu has a similar ajax library hosting service? :)
It had better put servers in China as the limitation from our National Firewall might mess things up sometimes.
Is there any files on your server have the same HTTP header set as thoese served by Google's CDN?If not, a simple testing can be deployed.