Every once in a while, someone comes up with a tool that makes you wonder what you ever did before using it. For me, Coda is that tool.
The interface is clean and doesn’t get in the way of doing work. In Edit mode, the code is color-coded for easy identification.
There’s a very cool CSS editor built in that allows you to quickly add and change your style sheets with a very nicely designed visual editor.
When you need to preview your work, there’s no need to fire up a browser. Coda provides a built-in preview tab.
If you need to SSH into your server, Coda provides that too.
Working with Coda on site development is like a dream within a dream!
There is also a good collection of third party plugins that extend Coda’s functionality. Check out their site at: http://www.panic.com/coda/