From Jonas' ETE 2011 abstract:
"We believe that one should never have to choose between productivity and scalability, which has been the case with traditional approaches to concurrency and distribution. The cause of that has been the wrong tools and the wrong layer of abstraction – and Akka is here to change that. Akka is using the Actors together with Software Transactional Memory (STM) to create a unified runtime and programming model for scaling both UP (utilizing multi-core processors) and OUT (utilizing the grid/cloud). Akka provides location and network transparency by abstracting away both these tangents of scalability by turning them into an operations and configuration task. This gives the Akka runtime freedom to do adaptive automatic load-balancing, cluster rebalancing, replication and partitioning.
In this talk you will learn what Akka is and how it can be used to solve hard scalability problems. We will also walk you through a real-world case-study using Akka to implement a highly scalable and fault-tolerant compute grid. Akka is available at akka.io (under Apache 2 license)."