Download statistics are an important requirement for project marketing.
Last year, Sonatype announced download statistics for OSS projects on the central repository:
The JBoss repository should also have this.
Even if a project (like drools or jbpm) is mirrored on central, only the originating repository (= the repository to which they were originally deployed) can show the download statistics (and the other repo's sync their info to it with a plugin).
See Sonatype's e-mail to Paul Gier (and Geoffrey De Smet) with setup instructions.