Usability 
Bing (formerly Live Search) has a very good implementation of Local Search which remembers your most recent entries and has the clearest maps I've seen on the mobile web. Maps scale to fit your phone's screen unlike Google and Yahoo's small fixed sized maps. Results are sorted by closest first. In my Local Search Shootout, which compared local search engines on the basis on the quantity and relevance of results and the efficiency of their UI's, Live ranked second, a scant one point behind the winner, Local.com.