Brain Rules - Understanding your brain will give you a better understanding of best practices for learning, understanding and retention.
Design for How People Learn - My favorite book on instructional design and a must read. I am a huge fan of Julie Dirksen.
Examples to Follow
Can you create a list of all your developer tools and explain what they do in 4 words or less?
Do you have notifications for your training? Use this tip on how you can ad motivations to your notifications to increase attendance.
"Another Engineer could use your spot in the workshop"
A big part of developer education is to increase the velocity of engineers so they can immediately begin providing value to the company. This article is a fantastic way to measure developer productivity by identifying blockers.
The Techknowcon community provides monthly presentations from industry thought-leaders on developer education best practices.