没有太多，就是收集文章的。mark如下：
http://www.memcached.org/
http://www.leonzhang.com/2011/06/24/memcached-vs-php-memcache/
http://stackoverflow.com/questions/1442411/using-memcache-vs-memcached-with-php
https://code.google.com/p/flexihash/
http://www.lnmp100.com/984
http://hi.baidu.com/farmerluo/item/9eb36ccd92bef5d9ee183ba5
https://code.google.com/p/memcached/wiki/PHPClientComparison