Here's a video presented by Abdelmonaim Remani of Oracle at JavaOne last year. From the original post:
What does NoSQL mean to my enterprise? What is it to begin with? Could this be just another fad? Is it a good idea to bet the future of my enterprise on these new exotic technologies and simply abandon proven, mature relational databases? How scalable is scalable? How do I choose the one that best fits my needs? What is this polyglot persistence I hear about? This session provides answers to these questions and many more and presents a survey of the most popular NoSQL technologies.