Google-CDN-newest-trick is a project mainly written in ..., it's free.
Cool little trick to keep google cdn pulls up to date automatically
Here is a little trick to keep the files that are pulled from the google cdn such as the jquery pull in the index of boilplate. As long as the file doesn't version up (example: go from jquery 1.9.8 to jquery 2.0) the cdn will send the newest file that is hosted.