Welcome to Apache CouchDB Project Wiki.
Apache CouchDB is a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP/JSON API. Among other features, it provides robust, incremental replication with bi-directional conflict detection and resolution, and is queryable and indexable using a table-oriented view engine with JavaScript acting as the default view definition language.
For more information see:
Using CouchDB
Basics: Getting started with CouchDB with different programming languages
Reference: CouchDB API Reference
How-To_Guides: Task-focused How-To Guides
Using_Views: Learn all about CouchDB views
EntityRelationship: How to model relations between your objects in CouchDB
When things go wrong
Community
Mailing lists - The place for CouchDB community support and where the developers discuss and make decisions about the future of CouchDB.
#couchdb - CouchDB IRC channel on freenode for community support and friendly chat. Note: IRC discussions tend to exclude large parts of the community. Therefore CouchDB core technical discussions and decisions must take place on the mailing lists, not IRC. They don't count otherwise.
Get involved
Books
As of August 2009, there are three books on CouchDB being written and due to be published in late 2009 or early 2010:
CouchDB: The Definitive Guide, O'Reilly Media, by J Chris Anderson, Jan Lehnardt & Noah Slater
CouchDB in Action, Manning, by Chris Chandler
Beginning CouchDB, Apress, by Joe Lennon