I work with a company that is regarded as one of the world's premier facilitation trainers. I own all 3 HotTips books by these guys, and the growth and learning I have gained and been able to use with all the audiences with which I work has accelerated my audiences' learning and created more FUN in both their experience and my facilitation.
HotTips for Facilitators gives the reader over 25 smart strategies that are not only graspable, but immediately applicable. I have used many already and they work wonderfully. Every strategy is presented with icons and quotes for faster recall and understanding, and the most user-friendly design I have ever seen.
This book has made a niche for itself in the forefront of my bookshelf, right next to the other HotTips books. I stongly suggest you get this book, both for you and the groups you facilitate.