What happened on August 16 - Skype Blogs
http://share.skype.com/sites/en/2007/08/what_happened_on_august_16.html
"The disruption was triggered by a massive restart of our users’ computers across the globe within a very short timeframe as they re-booted after receiving a routine set of patches through Windows Update."
skype allows two (30 April 2006, Interconnected)
http://interconnected.org/home/2006/04/30/skype_allows_two
"Why is this important? It means people could, in theory, build and run shops - from home - to sell music, video, and future large media files."