NorthScale's Steven Yen in his highly entertaining NoSQL is a Horseless Carriage presentation has come up with a NoSQL taxonomy that thankfully focuses a little more on what NoSQL is, than what it isn't: key‐value‐cache memcached, repcached, coherence, infinispan, eXtreme scale, jboss cache, velocity, terracoqa key‐value‐store keyspace, flare, schema‐free, RAMCloud eventually‐consistent key‐value‐