消息队列

1. RabbitMQ

http://www.rabbitmq.com/documentation.html

2. memcached

http://memcachedb.org/memcacheq/

3. Fqueue

http://code.google.com/p/fqueue/

4. beanstalkd

http://kr.github.com/beanstalkd/

5. Kafka

http://incubator.apache.org/kafka/design.html