A few weeks ago there was contact made with Jan van Lieshout who has started a push to implement an IcalSrv for syncing with eGroupWare. I must say I found this to be the most promising syncing effort to date, with Ical supporting many more clients and devices than the other efforts to date (remember, I have yet to have a satisfactory client syncing with eGroupWare).
Jan has been working hard to get eh framework completed, I have been doing my best to help with debugging, testing and setup in the wiki. We have both been put up for Junior Members of the development team and I have setup the IcalSrv wiki project page.
More as it develops!