In case you don't already know:
A nice multipurpose editor for (x)html, xml, css, hex and much more ...
Notepad++ (multiple files, multilanguage, opensource, free)
http://notepad-plus.sourceforge.net/uk/site.htmA WYSIWYG (x)html, css editor
NVU (multiple files, multilanguage, opensource, free)
http://www.nvu.com/index.phpEdit the source from your browser in these applications and apply the changes to your template.
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~GeeS~
You also may like this online css-editor (EN or DE):
http://cssmate.com/csseditor.htm