The current master and 0.7.0 branches will work with Apache Cassandra 0.7.0-x. Current releases on the downloads section should be cosidered production ready. You should always choose the most recent release. 
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Hector is a high level Java client for Apache Cassandra.
Apache Cassandra is a highly available column oriented database: http://cassandra.apache.org
Hector is the greatest warrior in the greek mythology, Troy's builder and brother of Cassandra
http://en.wikipedia.org/wiki/Hector
http://en.wikipedia.org/wiki/Cassandra


This client provides:

 o high level, simple object oriented interface to cassandra
 o failover behavior on the client side
 o connection pooling for improved performance and scalability
 o JMX conters for monitoring and management
 o configurable and extensible load balancing
 o complete encapsulation of the underlying Thrift API and structs
 o automatic retry of downed hosts
 o a type-safe approach to dealing with Apache Cassandra's data model

Detailed documentation of Hector features and usage can be found in PDF form hosted by Riptano: http://www.riptano.com/sites/default/files/hector-v2-client-doc.pdf

The work was initially inspired by http://code.google.com/p/cassandra-java-client/ but has taken off to different directions since.