iPod sales were unusually high this Black Friday, claims Kaufman analyst Shaw Wu. Several third-party retailers, in particular, are noted to have undergone spot shortages of the iPod nano and touch. "Our sources indicate that this is due to unexpected strong demand as many thought stand-alone MP3 players were a 'dead' category," says Wu, "but we believe the lure of multi-touch, apps, and attractive prices where the lack of monthly service fees (compared to a cellular contract), is helping."