Maybe people who are using non-relational data stores for actual work are employing it in tandem with RDBMS but most talk is about completely replacing RDBMS with NoSQL. This latest round of fun started with Digg replacing MySQL with Cassandra. Even other HN comments on this very article don't talk about using it tandem with SQL; most would probably consider that a waste of the advantages of NoSQL.

I use non-relational solutions combined with a RDBMS solutions but that seems to put me on the other side of the debate.