Madison, WI and Las Vegasâ?? September 16, 2008 â?? Netconcepts, the leader in natural search marketing, today announced company President Stephan Spencer and Vice President of Search Brian Klais are scheduled to speak at Shop.orgâ??s Annual Summit in Las Vegas. Shop.org, a division of the National Retail Federation, is the world’s leading membership community for digital retail companies. The Summit is featuring educational sessions and keynotes from retail leaders, September 15 â?? 17.