New services to store your digital music are coming online. “Today the computer remains the de facto content locker. But things may get more interesting as more and higher-speed Internet-enabled devices hit the market, from PDAs and car stereos to home entertainment systems and mobile phones. Suddenly, the computer and the MP3 player no longer are the keystones of the mobile-music experience, and there is less need to worry about transferring compatible files from device to device. Each connects directly to the content locker to play or download music.”