During the State Department-meets-Facebook event I mentioned here earlier, newish video content company Howcast showed a few of its how-to videos on political organizing, particularly in challenging contexts. Thought you might enjoy a look.
How To Create a Grassroots Movement Using Social-Networking Sites
How To Be an Effective Dissident
How to Smart Mob
How to Circumvent an Internet Proxy
Also possibly of interest -- the whole Alliance of Youth Movements event was geared towards producing a "field manual" on "Creating Grassroots Movements for Change," as a counterpoint, they say, to an Al Qaeda field manual found outside Baghdad in the spring of 2007. This grassroots activism guide work in progress, but the latest can be found here.