[jQuery] On-Demand Javascript?

[jQuery] On-Demand Javascript?

I was reading this article on Ajaxian:
http://ajaxian.com/archives/prototype-extension-dynamic-script-pattern-support
which discusses Dynamic Script Pattern or On-Demand Javascript. I think
this is a VERY cool feature. Does Jquery support something like this?
What are the pros and cons of something like this?
Rey...
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