Some NGO's can become self-sustained over a period of time and then can grow and multiply.
Volunteers can focus on cause and its corrective development. The NGO then becomes for profit venture but the funds are utilized for self-growth and sustenance.
You can visit NGO around neighborhood and understand their current running/operations. If possible discuss their self-sustenance model and growth. Provide ideas from our shared learnings.
If allowed to shoot video then you can interview the volunteers/owners there. You can also shoot the activities that they do there and post them at http://www.youtube.com/group/ngoneighbor.
Also you could develop the ideas with like minded people in orkut under community "NGOs around you".
The same has been responded to in linkedin.
There is a group in google that is developing similar ideas at http://groups.google.co.in/group/socialentrepreneur.