My most recent article is on jQuery plug-ins…
See Introduction to jQuery plug-ins (developerWorks).
The jQuery JavaScript library has excellent support for extensibility through plug-ins that you can consume, write, and share. In this article, learn about the benefits of creating a jQuery plug-in. Get started with a basic template, and then create a relatively simple plug-in example that adds Google Map support to your web page. Also learn about naming conventions, and about packaging plug-ins for use by other developers.
Plug-ins is one of jQuery’s most powerful features.
I hope you find this article useful…
ceo