Posted by Matt Soldo
From the Heroku Postgres Blog:
"One of the benefits of consuming a database through Heroku Postgres is that we are continually improving the service. This benefit is compounded by the fact that our service is based on PostgreSQL, a vibrant and active open source project. The release of PostgresSQL 9.1 had added a number of feature, performance and reliability improvements. These are available today with our beta support for PostgreSQL 9.1 ..."