Terrorism tends to spill over into "low-level warfare". I read a lot about revolutionary strategy and tactics, and at one point in my army career I considered becoming a counter-insurgency officer.
But ultimately I'm more comfortable with education. I consider my work at Wikipedia a long-term investment in home-schooling materials...
Sabotoging powerlines sounds like something Marxist guerrillas would do. The object is to make life under the current regime so miserable that people are desperate for a regime change. Then your group offers yourselves as the perfect alternative. Sometimes this works, sometimes not.
Anyway, I hope we can move this discussion to some talk pages soon. There's lots of great material here, hint, hint.
Ed