The Guardian Travel Advice Map
In the UK the Foreign and Commonwealth Office issues travel warnings and advice about countries it is safe to travel to. The Guardian newspaper has used Fusion Tables and Google Maps to create a world map of the 53 countries that the FCO currently has travel warnings for.
Even if you are not interested in travelling the world the map provides an interesting view of countries currently affected by conflict or disaster. Do bear in mind however that where the FCO has issued more localised warnings, for example not to visit Ciudad Juarez in Mexico, The Guardian's map displays the whole country as unsafe.