guangzhouworlda daily: How can you get more background on a specific TEFL course that I am thinking of taking?

Google the name of the course and then google the names of the people who have commented on it if you have any doubts about them being biased one way or the other.
Google the names of the people and organisations involved with it (e.g. accrediting organisations).
Start a thread in a relevant forum asking people for details.
Ask the course provider to put you in touch with people who have recently completed that course.
Contact people you might want to work for and ask for their opinion on the qualification offered.