After successfully installing the most recent version of Drupal, I copied the Aggregation module
to the right spot and checked the box for Aggregation and Aggregation Views on the Enable page.
When I try to add a feed, I get this using PostgreSQL 8.1.4:
* warning: pg_query() [function.pg-query]: Query failed: ERROR: relation "aggregation_feed" does not exist in /var/www/drupal/includes/database.pgsql.inc on line 125.
* user warning: query: SELECT * FROM aggregation_feed WHERE nid = 2 in /var/www/drupal/includes/database.pgsql.inc on line 144.