Here's a quick and dirty google search paper related to this subject:

Insurgency--What's in a Name?
An Integrated Look at Non-violence, Terrorism, Guerrilla Warfare, Revolution, Civil War and Coups

http://paladin-san-francisco.com/inindex.htm

I haven't read it, but the author quotes Clausewitz, so it must be okay...Here's one quote:

There are many familiar examples of non-violent insurgency: Ghandi's resistance to the British; U.S. Civil Rights marches; the refusal of American colonists to buy goods from England; the boycott of Captain Boycott by Irish peasants (from which the practice got its name); the 1926 British General Strike and the 1963 political prisoners' strike in Vorkuta, U.S.S.R. Another outstanding recent example was the 1968 Czech response to the Soviet invasion. That involved nearly-spontaneous resistance; advance planning and leadership were nil. Nonetheless it subverted some of the best Soviet troops, made them politically unreliable and weakened the Red Army's control over the population.