Are Cloud Based Memory Architectures the Next Big Thing?

Who are the Major Players in this Space?:

With that bit of background behind us, there are several major players in this space (in alphabetical order):
Coherence - is a peer-to-peer, clustered, in-memory data management system. Coherence is a good match for applications that need write-behind functionality when working with a database and you require multiple applications have ACID transactions on the database. Java, JavaEE, C++, and .NET.
GemFire - an in-memory data caching solution that provides low-latency and near-zero downtime along with horizontal & global scalability. C++, Java and .NET.
GigaSpaces - GigaSpaces attacks the whole stack: Compute Grid, Data Grid, Message, Colocation, and Application Server capabilities. This makes for greater complexity, but it means there's less plumbing that needs to be written and developers can concentrate on writing business logic. Java, C, or .Net.
GridGain - A compute grid that can operate over many data grids. It specializes in the transparent and low configuration implementation of features. Java only.
Terracotta - Terracotta is network-attached memory that allows you share memory and do anything across a cluster. Terracotta works its magic at the JVM level and provides: high availability, an end of messaging, distributed caching, a single JVM image. Java only.
WebSphere eXtreme Scale. Operates as an in-memory data grid that dynamically caches, partitions, replicates, and manages application data and business logic across multiple servers.