So while I'm optimistic about BusySync for gCal to iCal sync, I was dismayed by gCal mobile:
Google Mobile - Calendar:Ok, now reread that marketing drivel. What's not mentioned?
... On the go? Stay on track with Google Calendar on your mobile.
* Keep track of your schedule, without having to sync your phone with your computer.
* Share events and calendars with friends, family, or colleagues.
* Set up mobile phone notifications."
Oh, like, no ability to edit or remove calendar items? So you better make sure your "Quick Add" works, because you won't get a second shot.
Ok, rule that one out. At least, rule it out as a direct option.
Update: Oh, in case you were thinking of injecting the MobileMe calendar into the mix ... there's no support for feeds, or subscriptions in MobileMe calendar. Indeed, the ability to sync iCal calendars was lost in the MobileMe transition.