These slides are from a talk I gave at NoSQL Matters 2014 in Barcelona. It's not very technical per-se and more focussed on what kind of decision making is important to choose NoSQL technology (especially) when you are a startup.
provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases." https://en.wikipedia.org/wiki/NoSQL "Motivations for this approach include simplicity of design, horizontal scaling and finer control over availability."