Just wanted to announce a new Open Source Object Mapping and Client library for Cassandra that we have recently released at 47 Degrees.
Firebrand OCM is a simple library for persisting and querying Java Objects to Cassandra.
Among other features it includes a CQL query builder.
It ships with an Hector based implementation at the moment but other ways to access Cassandra may be added in the future.
For those of you interested in taking a look at it...