The official documentation has moved to http://docs.couchdb.org — The transition is not 100% complete, but http://docs.couchdb.org should be seen as having the latest info. In some cases, the wiki still has some more or older info on certain topics inside CouchDB.
There are a number of Common Lisp libraries, as one would expect:
These have not been updated recently, and unlikely to function with recent supported CouchDB releases, including basic things like attachments.
Cl-Couch - Full suite, includes client, view-server and object layer. Not updated since 2008. See http://kzar.co.uk/blog/2008/12/26/lisp-couchdb-cl-couch-example/ and https://github.com/ryszard/Cl-Couch for examples and current source (no longer on darcs).
cl-couchdb similar issues. Not updated since 2007.