Overseas Advisory Council (OSAC)
Private/US Government partnership. Issues travel advisories and announcements. Database of news items related to overseas incidents, mostly specific to US interests.

iJET Travel Intelligence
Commercial organisation providing detailed travel advice and warnings for various destinations.

UK Foreign & Commonwealth Office: Travelling Overseas
British government official travel advice and warnings for all countries.

Australian Department of Foreign Affairs and Trade
Official travel advice for Australians covering all destinations.

Fielding's DangerFinder
A somewhat 'gung ho' approach to dangerous places but contains detailed information about how to keep safe in some of the world's most dangerous places. Also has a traveller's bulletin board.

Lonely Planet Thorntree
The Lonely Planet travel guides' message board. Contains detailed questions and answers from travellers about the current situation in most places.

expatexchange.com
Registration for email newsletters containing critical travel warnings designed for US expatriates.

Air Security International's Hot Spots
Detailed listing of security related news items from around the world updated daily.

Travel Safety Information
Official travel advice and warnings from the New Zealand government.

Kroll - The Risk Consulting Company
Risk assessments for business travellers in the Middle East and Argentina. Register for email newsletter.

Sign in Safe
Offers the latest travel safety news, along with tools to monitor the safety of people as they travel.

U.S. Department of State: Travel Warnings & Consular Information Sheets
US government's official travel advice and travel warnings. Registration for automated email updates.