http://code.google.com/p/memcached/wiki/NewStart
http://en.wikipedia.org/wiki/Memcached
http://gigaom.com/2013/04/12/no-sql-or-dynamodb-airbnb-goes-with-memcached-for-neighborhoods-feature#body
http://www.linuxforu.com/2012/03/speed-up-cloud-with-memcached#content
http://www.unixmen.com/install-memcached-en-php-memcache/#post-12106