Tourism Concern: Tourism Concern works for ethical and fair trade tourism which benefits both, travellers and the people and places they visit. They expose tourism’s worst human rights abuses and campaign against them. In addition they promote tourism that benefits local people in tourist destinations. They have a great website with plenty of articles about voluntourism listed. Well, if you like it you can sign up for a membership which gives you access to a database full of materials. Tourism Concern cooperates with the German based campaign Tourism Watch, who have carried out (english) and collected (German) some great research about voluntourism.