"According to recent data from Nielsen//NetRatings, unique users of iTunes passed Apple’s QuickTime player in mid-2005, and at current growth rates iTunes should pass RealNetwork’s RealPlayer by mid-2006. While Microsoft’s Windows Media Player still has more unique users—80 million, compared to 30 million—iTunes is used over twice as long as either RealPlayer or Windows Media Player. The report says that RealPlayer, iTunes’ nearest rival, is used for 46.4 minutes per person on average, while iTunes is used for 111 minutes on average."A comparison to Windows Media Player is not quite fair since it is installed as the default player on pretty much every PC. Of course iTunes is pretty much required for all the iPods out there. Still pretty impressive that 30 million people chose to install it and use it so much more than the competition.