D6 version: I don't plan to port to D6. You are encouraged to try out CCK's experimental 'content multigroup' module instead to make your own custom multi-value fieldgroups.
This module simply provides a page which lists the number of nodes and comments in the Drupal database, and lists the users who have contributed nodes or comments, ordered by their total number of contributions.
Please note that this module should be considered alpha-quality at best, and should probably not be used on any production site.
This project will provide a simple but extensible API for aggregation that ships in a configuration that covers the most common use case of aggregating feeds as nodes on a web site.