http://www.bradsoft.com/topstyle/index.asp – TopStyle Pro, one of the best CSS & HTML editors on the market if you want to produce clean, compliant code by hand. Although it won’t do the coding for you (a la DreamWeaver), it does have ToolTips and hinting for almost every HTML and CSS entity, and even supports code completion.
The official tips blog:
Excellent tool for debugging low-level HTTP problems (e.g. GET, POST, Cookies, page compression, etc.):