There was recently an email discussion between myself and a few others which started off as concentrating on water and sanitation, but soon expanded (read: degenerated) into a brainstorm about general planning ideas and solutions for logistical issues.  I will re-post some excerpts and add commentary.

http://www.appropedia.org/Portal:Water

Water Portal at Appropedia -- good resource, many useful subcategories.

http://www.appropedia.org/Category:Water

Subcategories

There are 12 subcategories to this category.
Beyond dams
Greywater
Mosquito control
Pumping
Sanitation
Users interested in water and sanitation
Wastewater
Water and sanitation for developing countries
Water conservation
Water purification
Water quality
Water supply