If you're planning a trip to one of the countries in the Mekong basin area (Thailand, Vietnam, Cambodia, Laos, Myanmar or the Chinese provinces of Yunnan or Guangxi), or even if you live in the area, here's an interesting link: Responsible Tourism in the Mekong.
The site features responsible tourism operations and operators, and has been developed to complement existing travel guides to the Mekong Region. Designed with the intention of providing mainly independent travellers with a choice of responsible operators who will cater for all their needs: accommodation, activities, sites to visit, restaurants, shops, museums and wellness services, it can also help you find responsible tour operators if you prefer an organised trip.
P.S. Check out the logo!