This is incorrect, Google's CDN is cookie-less too.

    $ curl -I https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js
    HTTP/1.1 200 OK
    Content-Type: text/javascript; charset=UTF-8
    Last-Modified: Mon, 15 Nov 2010 20:40:52 GMT
    Date: Mon, 31 Jan 2011 20:03:57 GMT
    Expires: Tue, 31 Jan 2012 20:03:57 GMT
    Vary: Accept-Encoding
    X-Content-Type-Options: nosniff
    Server: sffe
    Cache-Control: public, max-age=31536000
    Age: 51530
    Transfer-Encoding: chunked