Travel Information and Advisory
The U.S. State Department maintains a current list of Travel Warnings, which are recommendations that Americans avoid travel to a certain country. Travel Alerts, by contrast, are a means of disseminating information about terrorist threats and other relatively short-term and/or transnational conditions posing significant risks to the security of American travelers. They are made any time there is a perceived threat and usually have Americans as a particular target group. In the past, Travel Alerts have been issued to deal with short-term instability, bomb threats to airlines, violence by terrorists and anniversary dates of specific terrorist events.
Travel Assistant
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Smart Traveler
This is a free iPhone application developed by the State Department for U.S. citizens traveling abroad.