Awesome handling of keyboard events. jwerty is a JS lib which allows you to bind, fire and assert key combination strings against elements and events. It normalises the poor std api into something easy to use and clear.

Peity (sounds like deity) is a simple jQuery plugin that converts an element's content into a simple mini pie, donut, line, or bar chart.

For backgrounds and whatever.

Total linkbait I know but there's some useful stuff here.

"Raphaël is a small JavaScript library that should simplify your work with vector graphics on the web. If you want to create your own specific chart or image crop and rotate widget, for example, you can achieve it simply and easily with this library."

A good edit-in-place plugin for jQuery.