A well-respected line of hotels is entrusting at least part of its customers' experience to Microsoft. Sheraton Hotels & Resorts announced today that a new online destination, dubbed the "Sheraton Guest Portal," will be powered by Bing. This arrangement is supposed to go well beyond putting the Sheraton logo somewhere on a modified version of the Bing homepage. It isn't meant to result in some one-size-fits-all site for all of the Sheratons around the world, either.