oaklander,
From man ls
Access Control Lists (ACLs)
If a file has optional ACL entries, the€-l€(ell) option displays a plus sign (+) after the file's permissions. The permissions shown are a summary representation of the file's access control list, as returned by stat() in the st_mode field (see stat (2)). To list the contents of an access control list, use the lsacl command (see lsacl (1) and acl (5)).
Hope this helps.
John