A nice way is to use an AJAX library is to take advantage of Google's AJAX Libraries API service. This is a bit faster and cleaner than downloading the JS and putting it in your /static/ folder and doesn't eat into your disk quota.
In your javascript you would just put, for example:
google.load("jquery", "1.3.2");
and/or
google.load(google.load("dojo", "1.3.0");
Somewhere in your header you would put something like:
And that's all you need to use Google's API libraries.
