A good post on getting volunteers involved. Some good points of like telling people why the tasks are important, and to give them a chance to try before they commit. We do this with our AV Team, asking people to just come by on a Sunday to the back of church to watch what happens and to ask questions after.
I had a friend recommend this site, he says it is great for collaboration with others on their church's video team for developing content. It is a tool that let's you annotate and comment videos, like you would a Doc in Google.