Infopath resource

http://www.microsoft.com/downloads/en/confirmation.aspx?familyId=54eb3a5a-0e52-40f9-a2d1-eecd7a092dcb&displayLang=en

http://social.msdn.microsoft.com/Forums/en-US/vsto/thread/852a9e55-192d-475f-b0e7-02f08962c1eb