No, Magenta, we do not have a spell checker for WinForms at this moment. We will consider creating such a control once we start working on a WinForms HTML editor.
Unfortunately we cannot commit to a certain deadline for this control at the moment, but if the interest is high enough we may start working on it earlier.
Could you give us some information on how you plan to use the spell checker? What formats/documents do you plan to spell-check? If HTML content, do you think that the functionality of our RadSpell for ASP.NET will be sufficient for your requirements?
the Telerik team