Gojko Adzic and David Evans starts a series of books with efficient catchy titles: 50 Quick Ideas…
I only read the one about User Stories for the moment, but you could be also interested in the ones on Tests and Retrospectives.
Illustrations of ideas are great, it helps to remember them.
Even if I already knew and used some of the ideas, the way it’s explain give sometime a better way to deliver the message to a team.
The structure of each ideas are: a short explanation of the idea, key benefits and a part on how to make it work.
The authors also created card decks with the same content (Start-up idea: I would like a digital card deck that I can carry in my phone please 😉 )