The Cambridge Guide to Teaching English to Speakers of Other Languages is a book that works as comprehensive overview to everything a teacher needs to know about TESOL. It is useful for those about to embark on some form of TEFL training.
The book calls on various leaders in the field of TESOL to write individual chapters on a wide range of topics. Amongst other things the text covers teaching methods, syllabus design, using computers and the Internet to aid teaching as well as how to introduce literature into the classroom. Each chapter also contains a useful bibliography section.
This is a great all round book for teachers who want to gain a grasp of the main issues in TESOL.