Here’s some cool stuff - Google’s Hosting some popular Javascript Ajax libraries like jQuery, prototype and the likes on their servers. You use this service to serve the supported libraries straight off Google. They also provide you with the option to load a particular version of the library so you won’t have to keep checking your code everytime a latest release is made.

Here’s how you would load jQuery version 1.2.3 using this API:

<script src="http://www.google.com/jsapi"></script>
<script>
  // Load jQuery 
  google.load("jquery", "1.2.3");
 //Continue using jQuery
</script>

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:

• jQuery
• prototype
• script.aculo.us
• MooTools
• dojo

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.

Links:

Google Ajax Libraries

Documentation