As expected, 50% cell phone users in the U.S. will use smart phones by the end of next year. This ABCNews video introduces several cool travel apps. Which one do you find most useful? I wonder how long it takes before I share another updates of cool travel apps. (If you cannot watch the video, please check the video out at my blog via http://linchikwok.blogspot.com/ or ABCNEWs.com via http://tinyurl.com/linchikwok08252010V).