My new book is up on Amazon: 39 No-Prep/Low-Prep ESL Speaking Activities- For Teenagers and Adults. If you teach middle school, high school or university, I think you'll find it useful. The activities really are low or no prep so you can pull something together in the last few minutes before your class.
I take a student-centered approach, unlike many of the other books out there because after all, your students should be working hard, not you. You're already really good at speaking English!