Calling iPod nano (4th generation) “the sleekest and prettiest of the bunch,” Nancy Wang (media.dukechronicle.com) extols its “aesthetically-pleasing exterior,” its built-in accelerometer, and the fun shake-to-shuffle feature. But she believes “the best thing about the newest iPod nano is that it allows listeners to enable the Genius feature” and generate new playlists with other similar songs on the fly.