Memcached 1.6.6 now available on Amazon ElastiCache

Amazon ElastiCache for Memcached has added support for the latest Memcached version 1.6.6. This version brings a number of enhancements, such as improved memory management reducing the memory usage from idle client connections and lowers the risk of memory fragmentation from large number of connections. Additionally, this version introduces the experimental meta protocol and meta commands. 

Source:: Amazon AWS