Agriculture, Environment and Natural Resources:

• From the FAO (Food and Agricultural Organization of the UN), some projects and developments
• World Agroforestry Center (ICRAF), ICRISAT (too long to spell out ... they do crop research), Alliance for a Green Revolution in africa (AGRA), Consultative Group on International Agricultural Research (CGIAR), here's their Gender & Diversity page.
• International Fund for Agriculture Development (IFAD, here's the rural poverty knowledgebase page), here's the indigenous people's page
• UNEP Indigenous people's page

Health-related:

• UNAIDS
• Partners in Health (a great organization, working in Haiti)
• Doctors without Borders, Mercy Corps (do good work, but they tend to focus on relief efforts)
• Projects from the World Health Organization (WHO)
• FGM Education and Networking Project

Human rights-related

• Amnesty International, Human Rights Watch
• International Organization for Migration (IOM), IOM & Gender page
• Coalition against trafficking in women (CATW)
• Global Alliance against Traffic in Women (GAATW)
• International Movement against all forms of Discrimination and Racism (IMADR)
• Stop the Traffik
• Not for sale campaign

Economics

• The Grameen Bank (ideas about financing of small-scale projects)
• Grama Vidiyal
• Opportunity International
• New Economics Foundation
• Global envision (comes from MercyCorps, which gives it credibility)

NGOs

• Project example from IIED in Bangladesh, IIED's main page has lots of resources as well
• From OXFAM
• Many resources on (Internat'l Development Research Ctr) this site
• Basic Education Coalition
• Indigenous people's center for documentation, research and information (doCip)
• Jeevika Trust

UN and multilateral aid organizations:

• From UNDP (there's a country project page, you might have to find English pages, though)
• More from UNDP
• Women and gender projects from UNESCO's site
• UN Millennium Campaign
• UNIFEM (violence against women page)
• INSTRAW (another UN institution--and Fox News had you thinking all they did was vote to denounce United States imperialism!)
• From the World Bank (There. I posted it. I need to go take a shower now ...)

Governmental Organizations

• Case studies from the DFID (Dept. for International Development) in the UK
• Canadian International Development Agency (use their project browser)
• Swedish International Development Cooperation Agency

Other

• Wikipedia's appropriate technology page
• Appropriate Rural Technology Institute (ARTI)
• Practical Action