WPYUI represents WordPress.com and YUI, as we know is short for Yahoo! User Interface Library, plus Hybrid Theme is the rock-solid, and I would say most comprehensive, and user-friendly WordPreses theme developed by Justin Tadlock.
After working for years, from knowing nothing about .php, .html and wordpress.com, I am now able to see how it works, and I can work around it, in order to display my wordpress blogs in an elegant and multiple display formats.
I hope Justin Tadlock will see this and will give comment or suggestion on what I am doing.
The theme is almost 3MB, and it calls YUI and hybrid theme locally, insude the theme folder. I have developed other child themes that call YUI externally, but only this year, I can now see how to call YUI locally.
I have other child themes, that I call Hybrid-Child that I developed from Hybrid News Child Theme developed by Justin here. It also calls YUI locally, but I use JQuery for the tabs. Whereas this theme uses YUI Tabview for the tabs.
I also learned a lot from YUI Bubbling Library developed by Caridy for the Yahoo Effects on mouse over etc.
Well, for me, this development is encouraging. I am now thinking of offering this theme to the public.