Fiddling with JavaScript

I have been working on some web stuff lately trying out different ideas with JavaScript and PHP. While trying learn some things in JavaScript I found a neat online tool called JSFiddle. Its kind of like a JavaScript IDE that let's you see your HTML, CSS, and JavaScript separated out and another window showing a preview of all your code running. I found it pretty handy for quickly trying out new ideas and will probably use it to show examples of JavaScript when I have something cool put together. Here's a link to it.