postgresql.org
This module implements the hstore data type for storing sets of key/value pairs within a single PostgreSQL value. This can be useful in various scenarios, such as rows with many attributes that are rarely examined, or semi-structured data. Keys and values are simply text strings.
joelonsql.com
До чего прогресс дошел... Интересно, будут ли попытки создать на этом PostgreSQL-based web-сайт и все такое?