I do all my coding, accept
css, in
HTML-Kit. A superb editor with a host of user created plug-ins. I could do the
css as well, in fact I sometimes do quick tweaks this way but my preference is to use TopStyle. TopStyle has a 'Lite', free version as well as the paid for version.
TopStyle from
http://www.newsgator.com/
HTML-Kit from
http://www.chami.com/html-kit/