www.codeplex.com
http://blogs.msdn.com/sharepointdesigner/
http://blogs.msdn.com/sharepointdesigner/archive/2007/07/06/porting-sharepoint-designer-workflows-to-visual-studio.aspx
http://blogs.msdn.com/sharepointdesigner/
http://blogs.msdn.com/sharepointdesigner/archive/2007/07/06/porting-sharepoint-designer-workflows-to-visual-studio.aspx