I know we had this conversation over on the dev list a while back:
http://www.mail-archive.com/dev@cassandra.apache.org/msg03914.html

I just wanted to let people know that we added the capability to our cassandra-indexing extension.
http://brianoneill.blogspot.com/2012/06/indexing-json-in-cassandra.html

Let us know if you have any trouble with it.

-brian

--
Brian ONeill
Lead Architect, Health Market Science (http://healthmarketscience.com)
mobile:215.588.6024
blog: http://weblogs.java.net/blog/boneill42/
blog: http://brianoneill.blogspot.com/