Would the people on this list be able to pinpoint the various governmental organisations/departments that have a) taken upon themselves a mandate to use FOSS, and b) are successfully using FOSS? Links to press releases / newspaper articles about such use would also be useful. If such a list already exists, could someone point me towards that?

We have started collecting information specific to the public sector(govt.s, NGOs) and FLOSS , see - http://public-software.in

specifically see sections on 'FOSS related policies - India' and 'Governments using FOSS in India' . We are in the process of building this list so its not really fully updated yet. We will also convert some sections of the site into a wiki so that people can add more details

Regards, Pranesh