I'm proud of this feed. One of my favourite sites to torture myself on is Responsible Travel
. This is a commerical site but it's entire ethos is on 'fair trade travel'. The holidays which I doubt I'll ever be able to afford are scenarios where you pay money and go rescue dolphins (and your payment goes to the dolphin rescue), or where you help build a hospital in some village in Peru, where you help clean up a beach, etc.
There's a feed at r_travel