For now we will suggest going with another 3rd party solution. We are leaning towards using the HTML format, rather than the somewhat outdated RTF. The reason is simple - Windows forms offer a very good HTML engine (Internet Explorer) which we can use right away. Even with this engine already available, we suspect
this task to take anywhere between 9 to 12 months in order to offer a useful editor.
For Q3 2009 we plan to rework our current HTML support to be more compliant with the HTML standard. We also plan to provide a rather basic HTML editor (run-time and design-time), which will give you and your users the ability to format text directly, rather than writing HTML tags. This basic HTML editor will be a toolstrip with tools for the currently supported HTML functions, such as bold, italic, underline, font. If time permits we will add some paragraph functionality (<p> tags, paragraph indentation, bullets/lists), and may be hyperlinks.
the Telerik team