And there's also HyperEdit. I quite like it because the preview is next to the source rather than below it. That's practical since my monitor is wider than it is tall — this way I don't lose as much context. However, I have to admit that I rarely launch it, since I almost never create any HTML by hand anymore, but instead generate almost everything in some form programmatically.
At Der Schockwellenreiter there's the original article.