http://code.google.com/p/memcached-tag/
http://blog.developers.api.sina.com.cn/?tag=php-memcached
http://code.google.com/p/dbcached/
http://tech.ddvip.com/2008-10/122405777578200.html
http://hi.baidu.com/jrckkyy/blog/item/cb68141e8afa621740341771.html