Teaching in another country can be an exciting and worthwhile undertaking.  It can also be one that is disappointing if done without good planning and preparation.  There are innumerable people and organizations recruiting teachers of English, for example, and some are much more reputable than others.  While there are no guarantees, below are some resources to assist you in researching these opportunities.  It is also recommended that you talk with individuals who have taught overseas, and learn what to look for, what steps need to be followed, etc., for any given country.  Remember, anti-terrorism rules have changed many of the previous rules for travel and visas.

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The major recruiting/placement resources:

http://www.iss.edu/ - one of the major, respected, and utilized recruiting sources for teachers and administrators - a must!

http://www.tieonline.com/

http://www.search-associates.com/

Lesser known resources... 

http://www.joyjobs.com/

http://www.ecis.org/

http://overseasdigest.com/teacher8.html

http://www.uni.edu/placement/overseas/

http://www.uni.edu/placemnt/overseas/osfair/fairoverview.html

http://www.transitionsabroad.com/listings/work/teachingk12university/recruitmentfairs.shtml

Accreditation

http://www.cois.org/

http://www.acswasc.org/