Among the role models, my favourites are Gram Vikas in Orissa - Joe Madiath, Goonj in Delhi - Anshu Gupta and Barefoot College in Tilonia, Rajasthan and the focus session on Women and Leadership by Jude Kelly.
You can read about our experience with them on the yatra at Yatra Saar 2010. After every yatra, the experience of those wonderful 18 days is compiled by a team consisting of yatris. This year's document is out. Glance at it, it's a little long, so you may not like to read all of it, but do have a look.
Download pdf of the summary of those amazing 18 days: Yatra Saar 2010