Business Week on Skype worth the read.

Niklas Zennstrom and Janus Friis could be the two most dangerous men on the Internet -- dangerous to entrenched business models, that is. The Scandinavian duo created the KaZaA file-swapping software that became the dominant online music-trading platform after lawsuits killed Napster in 2001.
BW Online | January 6, 2004 | Skype: Net Telephony as File-Trading