Question from fgump:

When you travel overseas, do you automatically purchase travel insurance?

A Yahoo Answer:

It’s up to you of course, but decent medical cover should give you peace of mind. The biggest problem abroad could be medical evacuation, which is the process of getting you back to your local hospital in the event something bad happens. A good place to compare products for international travel insurance is squaremouth.

http://www.squaremouth.com/visitors-insurance

Also, standard travel insurance is worth looking at to:
US residents - http://www.squaremouth.com

UK residents - http:/www.squaremouth.co.uk