I have tried Alfresco before, it seems the users are segregated with their own repositories, but can drop documents in the guest repository.
I was never able to change the guest page to display the repository.
Users had to navigate through the links on the guest page, avoiding the login prompt it seems.
I found dokuwiki, and it seems ok for now, but would like something thats stronger in the document handling area.
The wiki part seems ok.
The only things missing from dokuwiki are project tracking, as in attaching a tracker to certain topics, manipulating calendars and gantt charts....etc....
Currently I am looking at dokuwiki for results and agilefant for tracking.
I will ask again at the alfresco site if its possible, but alfresco doesn't seem as simple and neat as something like dokuwiki.
If you have any other suggestions, they are all welcome.