Development Environment for Jquery and javascript

Question

What develepment environment do you use when you need to work on javascript?What options have as an Asp.net developer for working with javascript or jQuery in order to have possibilities to test,develop in realtime?
I tried to set up the intellisense to make it work the jQuery documentation, but that's not working.
Right now i'm using Firebug to test my scripts and also editing there,but for example i would like to view the markup and the console together but that's not possible on FireBug.
i don't think that's the best solution for that kind of work.
If you have any ideea how to solve my problem or do you have a suggestion please post it here.

Thanks!

Update
JSBin
JSFiddle are nice alternatives too.

Answer 1

Try Aptana. It's free, it's awesome, and comes with JQuery & Prototype built-in. It also has screencasts.

Answer 2

The essentials.

1. Your favorite text editor. That's vim for me.
2. Google
3. Firebug
4. Web Developer's Toolbar
5. Two monitors (solves your whole "can't view source and the console together" problem)