Here is the pick of the best sites regarding ESL teaching and living in Koreas; and legal advice for foreigners:
www.eslcafe.com          The number 1 site for everything  ESL

www.efl-law.com          Awesome site for Korean legal info

www.hayeslaw.org          Personal answers to Korean legal issues

http://koreabridge.com          Korean community

www.molab.go.kr          The Korean Ministry of Labor

www.englishschoolwatch.org          Looks at teachers' problems       

www.geocities.com/prisonerofwonderland          When things go wrong

www.flying-cows.com          A reputable recruiter which does full checks

www.eslteachersboard.com          Useful message board for jobs

http://www.moveandstay.com          If you need some help relocating

http://www.esljobfind.com        A good place to look for global ESL work

http://www.geocities.com/esl_korea          Loads on working in Korea
To suggest a link, please email hagwon@aliveandkicking.com
Regional Sites
For wherever you are in Korea:

Seoul               Incheon

Busan              Ulsan

Daegu             Gwangju   

Daejeon          Jeju

Andong           Suwon