Brackets
It seems too good to be true: a free, open source web code editor from Adobe, called Brackets.
The video gives a good overview of what it is and how it works. I haven't yet downloaded and tried it, but I'm very interested in its live preview approach.
Unliked Dreamweaver and most other code editors, you don't have to launch a browser to preview your work after you've made changes. Brackets shows your document live in the browser, updating as you work on it.
The fact that Adobe is giving this software aware is pretty remarkable. I look forward to working this it, and will have a full report soon. In the meantime, here's a review from CreativeJS.com.