OpenSUSE developers announced csync
Andreas Schneider has unleashed the first public release candidate of csync 0.42, which is now available as source from the csync Web site, or via one-click for openSUSE 11.0 and 11.1.
Project homepage: http://www.csync.org/
This tool looks like a promising alternative to unison, which was written in ocaml, while csync is written in C
Did not have time to test it yet, but as soon as it proves that is working ok - i plan to replace unison with it.