The SyncML.org group is slowly making some progress …
I just downloaded the SyncML developer kit to take a look and see what they have created. I am a huge advocate of synchronization solutions, since they appear to be a mirror of biological evolution. I am still waiting for the ultimate sync solution so that my addressbook, cell phone, and Palm all contained the same data … but it’s not here yet …

SyncML 20010306 (Default). The official Synchronization Markup Language toolkit. [freshmeat.net]