UPDATE: v1.1 is out and supports IE. More details
If you havent heard of r.a.d editor for MOSS yet, you definitly sould. It's a free cross-browser alternative to the default content editor web part that add some really nice features.
It also has the capability to override the defualt content editor in sharepoint's forms (such as lists editing forms)
If you have heard of it, you'v probably tryed to install it, only to find out that it doesnt work! That is, it can be manually placed inside web part pages, but it doesn't automatically override the default editor in sharepoint forms.
It appears that Telerik's original agreement with Microsoft was to develop a cross-browser alternative to the default editor, and thats it. But obviously it provides richer behaviour and people wanted it to replace the default editor also in IE, So Microsoft has agreed to allow it's integration with IE.
So the next update of the r.a.d editor will allow integration in IE, and it is due next month.
Another thing worth to mention about the r.a.d editor is that that another version will be released in about 5 weeks that will present even reacher, full featured version of the current r.a.d editor for MOSS. That full version will require a valid license for r.a.d.editor.