Ori Herrnstadt introduces the Akiban database which solves the problem of joins and combines the best of relational and document databases.
Peter Bell introduces 4 NoSQL categories –Key-Value, Document, Column, Graph - and explains how one can use Spring Data to work with such data stores.
CouchDB is a schema-free document database. But now that the NoSQL movement is in full swing, there are several document databases to choose from, so why choose Couch? Two things really set CouchDB apart from the rest: its map/reduce views and its RESTful API. Since the API is RESTful, you can easily use Couch from any platform that can talk HTTP. The benefits go way beyond that, though.
Oren Eini talks about the difficulty to build N-tiered systems that are highly scalable, presenting several concepts – divide and conquer, background evaluation, one way messaging, the single responsibility principle - along with .NET frameworks – NServiceBus, Rhino ESB, Mass Transit, Rhino PHT, Rhino DHT, Raven DB - which help solving the scalability problem.