Hello Allessandro,
On Leopard there is a problem, if you have selected to create a
Calendar for each Context, the sync won't work. If you create the
Calendars by hand in iCal it will start syncing. If you have selected
a Calendar from the drop down then it should work ok.
The next update will replace the sync system. The new version will
integrate with Leopard's new system wide ToDo. I should have it ready
by next weekend.
Thanks