rsync:
http://www.netadmintools.com/html/5rsyncd.conf.man.html
http://finmath.uchicago.edu/~wilder/Security/rsync/

solution for "just accepts connections from localhost" problem:
http://www.enac.northwestern.edu/~tew/archives/2003/10/27/rsync-inetd-etc/

http://www.freeos.com/articles/4042/
http://samba.anu.edu.au/ftp/rsync/rsyncd.conf.html
http://lists.samba.org/archive/rsync/2002-December/004412.html