OtheRSync has been depreciated, I suggest you use [Unison]After the release of OtheRSync someone e-mailed me that a program called [Unison] existed already. Unison does the same thing as OtheRSync, only better and even between Windows and Linux machines (not that I think of ever using this feature myself ;-). Last summer when I started looking for programs doing synchronisation in two directions I didn't find it. When I found time to make one myself last week I didn't check again for other existing programs.
http://www.cis.upenn.edu/~bcpierce/unison/