just to point it out, postgres now has a builtin hash data type. This sees like ...

riffraff on Dec 17, 2009 | parent | context | favorite | on: Friendly: NoSQL With MySQL in Ruby

just to point it out, postgres now has a builtin hash data type. This sees like it could be a better solution thatn serialized json http://www.postgresql.org/docs/8.4/static/hstore.html