XE.com - Currency converter
AGlobalWorld.com - International dialing codes, time zones and travel distances
The Weather Channel - International weather conditions
TOWD - Worldwide listing of tourist offices
MapQuest - US maps and route planner
Map O Rama - European maps and route planner
Rail Pass - Guide for traveling by rail in Europe and Great Britain.
CDCl - Lists disease outbreaks worldwide and recommends vaccines Travel Health Online - Get a sense of health concerns for worldwide destinations
Travel Document Services - worldwide listings of documents and visas needed to enter countries.

Consular Travel Advisories and Warnings:

Australian Dept. of Foreign Affairs
British Foreign and Commonwealth Office
United States State Dept.

Passport Offices:

Australia
United States
United Kingdom