Here's the recipe (using my user-name as an example):

1. log in
2. connect to your member folder (by clicking the my folder link in the title bar)
3. Click on Switch to Contents view in the left hand margin navigation box
4. Create a new folder within your member folder. You do this by pulling down the pull-down list that says select and choosing Folder, then clicking on add new item. This takes you to...
5. The Edit Folder Properties screen. Enter the name (which goes in URLs) and title of (what shows up on the screen) your new folder. I named mine "group-vis-folder" and gave it the title "Group Visible Items"
6. Next, you need to set the protections so that non-Fluid folks can't see the folder or its contents. Do this as follows:
   1. Using the navigation box in the left column, navigate your way to the folder you just created inside your personal member folder.
   2. make sure you are in "Item View". If not, click on Switch to Item view to get there.
   3. Go up to your browser's URL bar. Type /manage after the URL showing there (In my case, this is "http://.../dfsuther/group-vis-folder"), and hit a carriage-return. This will take you to the Zope Management Interface for your newly created folder.
   4. Click on the Security tab near the top of the window in the right-hand pane.
   5. Scroll down to find the line for "View". The list is alphabetic, so it's near the bottom.
   6. Uncheck the boxes for Acquire and Anonymous, and make sure that the boxes for Authenticated, Manage, Member, Owner, and Reviewer are checked.
   7. Do the same for the access contents information line...
   8. ... and the List Folder Contents line.
   9. Scroll down a little farther and click the Save Changes button. This will take you to a...
   10. "Your changes have been saved" page. Click the OK button.
   11. You're done with Zope. Go back to the Fluid web pages by way of your favorite link.
7. Navigate your way back to your personal folder. The my folder button in the Plone title bar is a convenient way to get there.
8. Edit your Home Page to have a link to the "Group Visible Items" folder. If you followed this example, and if you use Structured Text, your link might look like:

      "Group Visible Items":group-vis-folder -- The
   contents of this folder are visible only to
   members of the Fluid Group.
   

9. Now you can put project-private information into the folder you created. The link to the folder will be visible to the general public. The folder itself, and all of its content will be visible only to logged-in members on the web site.