The International Programs Office can recommend a number of agencies and / or websites with which to research to learn more about opportunities to work, intern, or volunteer abroad.  Check out the following to get started...

JobsAbroad.com
Great resource for those who wish to volunteer, teach, or work abroad.

BUNAC
Overseas work / travel programs in Britain, Ireland, Canada, Australia, New Zealand, South Africa, and Peru.

WorldTeach
Organization dedicated to assisting those who wish to teach in developing countries.

Cross-Cultural Solutions
Program which offers a variety of options for volunteering abroad.