As Ludo mentions in his announcement about RC 1 for OpenDS 2.2, this release adds external changelog access. Directory applications access the changelog to follow what updates are happening to directory data, and so find the changelog useful when aiming to stay synchronized.
Rob Byrne, who has been stitching together big identity deployments for the last few years, writes about how Sun Identity Manager seems to work fine with the OpenDS changelog, just as it does with the Sun Directory Server changelog. Rob hasn't tested every case, but it looks promising.
