Winmodems do not work with Linux. 
Almost every PC Dell, Gateway, Compaq, HP, etc, use winmodems. Thats a lot of winmodems. 
Means linux will have to find a way to get a winmodem to work with linux if they want to become a major player in the desktop arena. 
Course, broadband is coming too, but still a good many people are stuck with winmodems.