Today I was looking for some javascript to add keyboard shortcuts to my project. And after little search on google I came across a very cool and lightweight javascript library shortcuts.js .
This library allows you to make keyboard shortcuts on a fly.
Example:

shortcut(”Ctrl”,function() {
alert(”Hi there!”);
});

Please visit this site to know more about this javascript library.

While surfing on net I came across a javascript library(animator.js) based on prototype library written by Bernie Sumption.
I found this library a bit interesting. One that appeals me is the ability to define start state and end state through CSS
See in action here.