Crossover queen Shania Twain debuted at No. 1 this week. Other chart debuts include the latest installment of the "Now..." series, Ja Rule and Audioslave. See them all, and more, now. music_twain_shania_up.jpg 1 Chart Watching ffc055 video.gif http://smilparse.real.com/showcase/cliplists/1102/charts1129.ram 10385946655330 LAUNCH THE COUNTDOWN lock_icon.gif lock_icon.gif lock_icon.gif big_headline