I presented this at the Ignite Talks at Over-the-Air 2013:
There is now also a video available:
Ignite Talks have a really interesting format: exactly 20 slides in exactly 5 minutes. Slides automatically advance after exactly 15 seconds; so you have to be really concise.
I talked about developer evangelists best practices, which I summarise in my Onion model.
My slides alone are not too useful if you did not attend my talk. That is why I paraphrase the narrative on my blog.
Find it here: