Doc taxonomy, using tags
Fully sortable and filterable doc lists
TinyMCE front-end doc editing
One-editor-at-a-time prevention against overwrites, plus idle detection/autosave
Dashboard access and management of Docs for the site admin
The authors said:
This is BETA software. There are many bugs and missing features. DO NOT USE ON A PRODUCTION SITE.
REQUIRES WordPress 3.1 or higher. Lower versions of WP may appear to work, but will compromise the privacy of your Docs.
Download and info: http://wordpress.org/extend/plugins/buddypress-docs/