John Field, the bad boy of ELT writers.
Reading this book, I reflected on Celta and Delta training, and said to myself, Oh, man! That's not what I was taught. At least 3-4 times, I thought, this rocks the boat. Just as an example, rising intonation of questions. In short, research data doesn't always comport with teacher training and traditional wisdom of coursebook/materials design.
Highly recommended. Chockful of techniques to do in class. But the only problem is that they're often time-intensive as far as prep. And most are geared toward high-intermediate and advanced Ss and EAP. Not that activities for beginners are avoided. It's just that there's a treasure trove of good ideas for higher-level students.