San Antonio-based Rackspace Hosting is launching a new effort to promote sites using the firm's hosting services, the company said today, as the holiday shopping season kicks off. Rackspace said that it will offer a lists of discounts and coupons to encourage holiday shopping at the more than 2,0000 e-commerce stores who use its services. The discounts are listed on its NoMoreServers.com web site. Rackspace said its customers include such firms as Coca-Cola, Levi Strauss, ULTA, Bonobos, TeeFury, and ChristmasLightsEtc.