Is there an awesome HTML/JS editor that I'm missing?

Question

I'm wondering if there's an HTML/JS equivalent to LINQPad, really. Something that I could use to write some really quick disposable/portable code, without having to jump through the hoops of running our full web application in Visual Studio.

I know there's jsBin and the (IMO) more feature-rich jsFiddle, but I'm wondering about a client-side application that I can use to very quickly mock-up some structure and script (mashing F5-style). Or a web-app that is a little more feature-rich and a little less prone to erase my code halfway through or want to make it publicly available. Something that auto-completes tags, shows updates on-the-fly, etc...

Anyone know of anything like that?

Answer 1

On a Mac, I enjoy using Textmate. Many people swear by it.

On Windows, I typically use notepad++.

Both of these applications are very lightweight, run smoothly, but get the job the done well and quickly.