Have you seen the AJAX libraries API from google? They can be found here: http://code.google.com/apis/ajaxlibs/
What are they?
Basically its a content distribution network (CDN) for the most popular JavaScript libraries such as JQuery. It provides the officially released libraries in a gzipped form, served from a global CDN, so that your end users hit a server near them.
I feel like I’ve been living under a rock to have just discovered this service. It looks pretty easy to implement.