Via HN. Good to hear that ARIN have successfully migrated their database from Oracle to PostgreSQL. Not sure if they are using the plain vanilla or commercialized version.
PostgreSQL is the most under-appreciated and unknown open-source database. While more features were added, they've lost the popularity game to MySQL for two main reasons. Lack of Windows support in the earlier version and availability from web hosting provider. I wish more people would add PostgreSQL into their technology stack consideration instead of just MySQL.