Yahoo! UI Library
I don’t know if its because of their trying to compete with Google in the cool factor or what, but Yahoo has released some cool libraries and design pattern docs for creating interactive sites. I want to play with it sooo much right now, but I have a midtern in statistics tomorrow. Anyway, even if I don’t use their code I will be using it to learn how to do some cool things for a project I’m trying to figure out right now. Check out the Yahoo! UI Library and the Design Pattern Library.