CouchDB: The Definitive Guide does a good job covering the features that make CouchDB such an exciting technology - schema-free document-based storage, REST API, MapReduce, powerful replication, embedded applications, etc. I'd recommend it for developers with a good background in web programming that are looking for a new way of building and scaling applications. Database administrators will also benefit from its coverage of replication and sharding.
The organization and editing are, unfortunately, not so good. Topics seem strangely ordered, cross references are awkward, and chapters alternate between repeating material unnecessarily and assuming knowledge of material that has not yet been covered. I'd guess this comes from merging the work of three authors, but O'Reilly usually does a better job cleaning up the inevitable collisions with this CouchDB: The Definitive Guide.
That aside, this is still a good introduction to the subject, and will give you enough background to start exploring CouchDB without getting (too) lost. Well worth a place on your NoSQL bookshelf.
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