可以当作字典来查询各种命令及应用场景，有事没事多看看。
Linux系统IP层网络管理指南： http://linux-ip.net/html/index.html
GPG的中文使用文档，安全通信的必备神器。http://www.gnupg.org/howtos/zh/index.html
淘宝核心系统服务器平台组成员共同写： http://tengine.taobao.org/book/index.html
以下几点是二者很明确的差别，可以根据自己需求来选择适合自己的。
- redis persists the entire dataset to disk
- redis doesn't support LRU or any similar policy for handling overload
- redis doesn't support CAS (check and set) which is useful for maintaining cache consistency
- redis supports richer data structures other than plain strings and can operate on them internally. For example, you can intersect two sets and return the result.
- redis supports master/slave replication
如果以上几点不是你最关心的，那么你可以参考如下的对比测试：
最好你自己进行测试一下，因为这是以前低版本的测试数据。（注意：不要用虚拟机进行测试）
- http://systoilet.wordpress.com/2010/08/09/redis-vs-memcached/
- http://oldblog.antirez.com/post/redis-memcached-benchmark.html
- http://www.quora.com/What-are-the-differences-between-memcached-and-redis
- https://chrome.google.com/webstore/detail/proxy-switchysharp/dpplabbmogkhghncfbfdeeokoefdjegm
- https://github.com/chenzhiwei/linux/raw/master/resources/switchy.txt