There is a big news: docman-2.0-pre1. This is development release, and whlile it's probably not ready for production yet (-pre2 will be!) It's a great way to get used to new concepts: repository which is not in web server tree, ACL implementation called trustee and bulk of new documentation. This docman works without a problem with register_globals off in php.
users in SQL database, ability to hide files are just two new features of this release