Fco.gov.uk
An excellent first point of reference for anyone considering travelling to a politically - or geographically - unstable destination. This is where you'll find the Foreign Office's official advice on everything from the risk of terrorism to how bad the roads are in a particular country or, in some cases, whether it believes you'd be better off staying at home. With detailed country-by-country listings, it's a doddle to navigate.
Like that? Try www.travel.state.gov