From DEAN LEE:/DEV/BLOG:

FCKEditor is a full feature web based WYSIWYG html editor,the best things is that:FCKeditor is compatible with most of the internet browsers which include: IE 5.5+ (Windows), Firefox 1.0+, Mozilla 1.3+ and Netscape 7,and claims to produce clean and valid XHTML 1.0 output.

Dean’s FCKEditor for WordPress plugin(V1.2)>>