Google Ajax API CDN (Also supports SSL via HTTPS)
http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
http://code.google.com/apis/ajaxlibs/documentation/index.html#jquery Google Ajax CDN Documentation]
Microsoft CDN (Also supports SSL via HTTPS)
http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.2.min.js
Ajax CDN Announcement, Microsoft Ajax CDN Documentation
jQuery CDN (via Media Temple)
http://code.jquery.com/jquery-1.7.2.min.js Minified version
http://code.jquery.com/jquery-1.7.2.js Development (Full) version