Resolved
The add-ons catalog and provider resources are now restored from a database backup.
A single provider user account, created after 2010-09-20 04:59:12.854062 PDT was lost due to this issue. We apologize for any inconvenience.
Issue
The add-ons catalog (http://addons.heroku.com) is currently not online due to a database issue.
Add-ons can still be installed and uninstalled normally from the command-line.
We expect the catalog to be restored within a few minutes.