I tried (using Hardy Heron 8.04) simply right-clicking on the folder I want to Share, and there is a new automatic tool.

Right-click... Then, "Sharing Options".

Unfortunately, I get an error on the "File Manager - Folder Sharing" window...

'net usershare' returned error 255: net usershare: cannot open usershare directory /var/lib/samba/usershares. Error Permission denied
You do not have permission to create a usershare. Ask your administrator to grant you permissions to create a share.

Is this a bug?