I got past the previous error by putting in litterally
http://sitename.org/Pages/Default.aspx for the SiteUrl value.
I'm trying a local reference to the SiteListName with "/Lists/Tasks/" and that produces an "Error at Data Flow Task[SharePoint List Source : System.ServiceModel.ProtocolException: The content type tezt/html; charset=utf-8 of the response
message does not match the content type of the binding (text/xml; charset=utf-8) etc...
hints gratefully accepted.