The AJAX Libraries API is a content distribution network and loading architecture for the most popular
open source JavaScript libraries. By using the Google AJAX API Loader’s
google.load() method, your application has high speed,
globaly available access to a growing list of the most popular JavaScript open source libraries including:
Google works directly with the key stake holders for each library effort and accept the latest stable versions as they are released. Once we host a release of a given library, we are committed to hosting that release indefinitely.
AJAX Libraries API - Google Code