rsync is a replacement for rcp (and scp) that has many more features. It uses the "rsync algorithm" which provides a very fast method for remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand.
ldapsync.pl is a simple Perl script that uses Net::LDAP to copy new and updated records to a second LDAP server. Although most LDAP servers offer some sort of replication facility, this approach allows the frequency of updates to be controlled. It can be used to copy information between LDAP servers in different security layers without the individual servers having permission to contact each other. It was developed using the SunONE Directory Server on Solaris 9.