This is a "seminal" and important article regarding the teaching of grammar. If you do teach grammar and are serious about your teaching - take a read. Rod Ellis really says some important things.
English Language Teaching is a journal with a lot of fully accessible articles for research and prof. development. Here are a few examples.
I work in Ontario Canada and we have some great resources for teaching teachers about the special needs of English Language Learners. This page has some wonderful videos and support materials.
Here are a couple more nice handbooks with helpful advice, research.
These general articles about a few topics of vital importance to TEFL.
Some important articles on some vital TESOL topics.
This lecture gives a nice broad overview about the strengths and weaknesses of the two main approaches in ELT - Communicative vs Structured.
This outline by Dr. Ellis - Principles of Language Instruction is a handy reference and description of what teachers should be focusing on.