This is a PDF infodeck written by Pramod and me that provides a brief intro to NoSQL databases. Our intention is to explain to a technical manager audience why NoSQL databases are important. We describe why relational databases have been so dominant and what forces have led to NoSQL cracking that dominance. We discuss the principal benefits of a NoSQL approach, but stress that relational databases still have a large role to play, thus our emphasis on polyglot persistence.
For more on this site about NoSQL databases and Polyglot Persistence, take a look at my NoSQL guide