Avoid data charges for big downloads on the road by lining up your music and entertainment purchases before you head out that door. Does your airline offer good in-flight entertainment? If not, a few episodes of your favorite show might make coach class a little more bearable. Will your hotel room have an iPod player? If yes, then a new album or two could enliven your stay. Further, there's little that will improve a long cross-country rail trip or an interminable wait at the airport more than a diverting and fun new playlist.