Some of them that I know about are vhector and clj-hector . Preference is given to active libraries. Thank.
I don't have first-class knowledge, but here is a list of Cassandra Clojure libs sorted by the number of GitHub watchers:
http://clojuresphere.herokuapp.com/?sort=watchers&query=cassandra
, . " " . lib , . Lib .
alia clojure -news - 20000 8 47 95 . CQL 3.
Java Cassandra, , Clojure .
, Java Clojure, Java, Clojure .
update since cassandra offers cql support:
https://github.com/mpenet/alia is a good choice, it relies on the "official" Java driver from Datastax (using the new proprietary protocol introduced in cassandra 1.2).
There's also Clojurewerkz Cassaforte: http://github.com/clojurewerkz/cassaforte 1.2+ a ready-made library
Here is a getting started guide: http://clojurecassandra.info/articles/getting_started.html