php 扩展 memcache下载地址：
http://windows.php.net/downloads/pecl/releases/memcache/3.0.8/
Memcached for Windows 下载地址:
32位 1.4.4版本?http://s3.amazonaws.com/downloads.northscale.com/memcached-win32-1.4.4-14.zip
64位 版本?http://www.urielkatz.com/projects/memcached-win64/memcached-win64.zip