This is an interesting data store I came across. It looks like it fills a similar roll to Apache Zookeeper. HBase uses Zookeeper in order to manage multiple nodes. While Zookeeper is written is Java, Doozer is written in Go with clients in Ruby and Erlang. It looks like the comm protocol is a combination of 9p (Plan9) and Protocol Buffers. Interesting.
Doozer's focus is on providing a highly-consistent and highly-available data store. To quote "Doozer is a highly-available, completely consistent store for small amounts of extremely important data."
Sounds like it's worth a look.