WHO - World Health Organisation, information on diseases and vaccinations needed for most countries. Also up to date statistics on outbreaks and containment policies.
UNMAS - Website of the United Nations Mine Action Service, coordinating and facilitating the removal of land mines and other explosive remnants of war
UNOPS - United Nations Office for Project Services, handling infrastructure, vertical and horizontal contruction projects on behalf of sister UN agencies, Government bodies and NGOs
Lonely Planet - The same people who produce the ubiquitous travel guides. Good background information on visas and travel in countries off the trourist routes
Project Management Institute - Providing resources and benchmarks for professionals in the project management field
Engineering Toolbox - A great resource for field engineering and construction personnel. Includes a set of handy unit conversion tools to save counting sheep.
X Rates - Currency conversions and monitoring tools for expats who travel the world
UTM converter - A handy utility to get UTM GPS coordinates into Google Earth. We maintain this for legacy purposes now, Garmin desktop software can do this seamlessly
"Perpetual optimism is a force multiplier"
-- Colin Powell