The astounding Adult Literacy and Numeracy Tutor Manual: From Research to Practice has recently been released as a joint venture between Libraries Tasmania and TasTAFE (Tasmanian Technical and Further Education) and was designed to help tutors build learner confidence, independence, and opportunity.
It's an immense tome and has been split into three downloadable PDFs. Although written for the Australian many resources and much of the information is suitable for all branches of English teaching.