Open science is still rather new as a concept to many researchers, funders, research administrators, science journalists, educators, students, librarians, publishers and others, as well as the wider public.
It has however been around for a while, so a range of materials have already been produced to introduce specific audiences to the topic, e.g. the Wikipedia articles on open research and open science or Michael Nielsen's TEDx Waterloo talk.
If you know of such materials, please post them here (one answer per resource), ideally with some comments, e.g. on target audience, strengths, weaknesses and topicality. The answers will inform an initiative that is exploring to build an Open Science 101.