Hodejo1 writes "'Big announcements' are often backed up by a dubiously small data set or not backed up at all. Big Champagne, PC Pitstop and Digital Music News joined forces to analyze 1,661,688 PCs to track 152 unique P2P clients quarterly from September 2006 to September 2007. The result is a definitive list of the most popular P2P software in use. Topping the list by a healthy margin is LimeWire. 'In September of 2007 LimeWire was found on 17.8% of all the PCs polled that month. With regards to market share — counting only those users with at least one P2P application on their systems — LimeWire held a 36.4% share, meaning one out of three P2P users has LimeWire on their system. These numbers are up slightly from September 2006 when LimeWire held a market share of 34.1%'. Meanwhile, uTorrent has made huge gains during this period soaring into second place and posing a genuine challenge to LimeWire."