An interesting item by Omar Tawakol at SearchInsider on why mobile search needs to be different from desk-top search.
…assuring a pleasing mobile search means a number of things, including: providing consumers a click-saving experience that returns answers instead of links; inferring a consumer’s context from his or her device, location and other information within ranking algorithms; balancing the subscriber’s short-term and long-term preferences to present personalized, relevant results that adapt to a consumer’s changing context; and providing rich client interfaces with streamlined interfaces including custom shortcuts, auto-completion of search terms, or voice inputs to simplify the user experience.