Links for dialog

http://www.learningsharepoint.com/2010/09/05/passing-parameters-to-the-dialog-sharepoint-2010-client-object-model/

http://blogs.msdn.com/b/jfrost/archive/2009/11/08/how-to-display-a-sharepoint-dialog-from-ribbon-button-and-get-selected-item-context.aspx