My environment:
ZCS trial v5.0.6
mobileme with .mac account
leopard 10.5.4
ical 3.0.4
zimbra isync 5.0.2301

contacts sync just fine
calendar seems to sync, and in ical there is a new subset of calendars from the zcs server, but those calendars don't sync to mobile me, and hence don't sync to my iphone.

is this supposed to be the case? since they are actually separate caldav servers?

Thanks!