coded real-world examples of themeable buttons and toolbars using the jQuery UI CSS framework, a system of classes developed for jQuery UI widgets that can easily be applied to any plugin, and even static content.

http://www.filamentgroup.com/examples/buttonFrameworkCSS/
http://www.webdesignerwall.com/tutorials/css3-gradient-buttons/
http://csswizardry.com/css3/

Quite simply, SlickGrid is a JavaScript grid/spreadsheet component.

Some highlights:

Adaptive virtual scrolling (handle hundreds of thousands of rows)
Extremely fast rendering speed
Background post-rendering [...]