The latest released stable version is Syncal-0.8.9. The source is available at http://hopf.math.northwestern.edu/syncal/syncal-0.8.9.tar.gz Here are the changelog and the manual page. This release includes a patch to the ical tcl code. The patch is small and simple. It adds an item to the File menu of the "dayview" ical window allowing the user to click to execute syncal.
This version includes support for some features of the datebk3 Pilot application which is an alternative to the standard Palm DateBookDB. See http://www.gorilla-haven.org/pimlico/datebk3.htm for more information about datebk3. The features supported by syncal include support for categories and for floating todos.
Thanks: I would like to thank a number of people for contributing bug reports and fixes for syncal. They include the following: Mike Bloy, Dennis Director, Chris Fedde, Hiroshi Kawashima, Bradley Kuszmaul, Tessa Lau, Dominik Madon, Kaj Mustikkamäk and Romain Kang. If I have missed someone (not unlikely) please let me know.