Learning

Give me your best references/websites to learn JavaScript/AJAX/CSS.
GO!

I already know most basic stuff in CSS but I feel like it isn't enough to call my knowledge about it "decent".

You want JS on the web? Learn it by using this:
http://jquery.com/
http://jquery-ui.com/

You want JS on the server?
http://nodejs.org/

Plenty of node.js info out there.