The students in the Berkeley class on participatory media/collective action that I teach with Xiao Qiang put together a guidebook to participatory media, aimed at activistists and non profits. Here, one of our students blogs about it:

We created the Participatory Media Guidebook to introduce a range of participatory media tools for collective action to activists and social justice organizations around the world. The guide discussed what tools to use and when to use them. It is a wiki, so it will always be evolving and updating. Please participate by adding your own expertise on how to use new media to change the world.