Intro
LogCabin is a distributed system that provides a small amount of highly replicated, consistent storage. It is a reliable place for other distributed systems to store their core metadata and is helpful in solving cluster management issues. LogCabin is still in early stages of development and is not yet recommended for actual use.
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ZooKeeper: Wait-free coordination for Internet-scale systems (USENIX '10)
Zab: High-performance broadcast for primary-backup systems (DSN '11)
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Paxos Replicated State Machines as the Basis of a High-Performance Data Store, video (NSDI '11)
Viewstamped Replication
Paxos Made Practical (not published, '07). Note: despite the title, this is actually about Viewstamped Replication, not Paxos.
Viewstamped Replication: A New Primary Copy Method to Support Highly-Available Distributed Systems (PODC '88)