Great for Projects Like This...
Of course I've squashed up the windows for the screenshot below, but you get the idea. Smultron is a simple HTML editor that can handle several documents in a single window with navigation between them via the panel on the left, or via Command-1, Command-2, Command-3 etc. What's more, the window with several documents can be saved and re-opened as a project.
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There's also a mini-browser built in for previewing the pages, and I really love this, you can undo changes after saving a file in order to preview it.