For travel warnings and where and how to apply a passport .....

US State Department – Bureau of Consular Affairs

For your health and disease concerns 

CDC for Travelers’ Health

Weather Around The World

Weatherlab

USA Today Weather

For Celsius to Fahrenheit, or kilometer to Mile Conversion!

Digital Dutch Unit Converter

Legacy Systems Converter

For the currency conversion!

Yahoo Currency Converter

Oanda Currency Converter

For the Time Around the World!

CNN World Time (need download Micromedia Shockwave, has local time and time conversion)

World Time Zone (has local time for various countries)

Time And Date (the Meeting Planner - has multiple cities time display)

Maps, Maps and Maps!

Yahoo Maps (domestic only but has driving direction)

National Geographic Maps (by region and country)

University Texas Map Library (has some city and airport maps)