I've just released an Add-On plugin for WPDR: "WP Document Revisions Simple Downloads"! See full description and feature list: http://wordpress.org/extend/plugins/wpdr-simple-downloads/
Main purpose: use WPDR as a simple download manager with a robust base & custom post type. Also great for small teams.
--> Re-branding/ Wording as "Downloads" (instead of "Documents")
--> 3 additional widgets
--> Basic download counter
--> some other minor stuff...
Does no permanent modifications, just uses existing Hooks & Filters of WPDR + WordPress.