Hunger:

World Food Program
http://www.wfp.org/

International Food Policy Research Institute, publishes
Global Hunger Index every year
http://www.ifpri.org/

Water:

World Health Organization water page
http://www.who.int/topics/water/en/

Unicef water page
http://www.unicef.org/wash/

Children:

Children’s issues, country pages, statistics
http://www.unicef.org/

World Health Organization on child health
http://www.who.int/topics/child_health/en/

Education:

Unicef education page
http://www.childinfo.org/education.html

Micro-Enterprise:

USAID
http://www.usaid.gov/our_work/economic_growth_and_trade/micro/index.html

Microcredit pioneer Grameen Bank
http://www.grameen.com/index.php?option=com_frontpage&Itemid=68

Humanitarian news:

http://www.irinnews.org/IRIN-fp.aspx

http://www.alertnet.org/