Sync gCal with iCal

Perhaps abit of an alphabet soup, but being able to merge and sync Apple's iCal with Google's gCal will be useful for me for one simple reason:
SmartTime iPhone app will soon support syncing with gCal.
This app is brilliant and easily the best productivity app I've used so far (and I've tried practically every free ToDo app on App Store!). Its dead easy to add new tasks, and rearrange them one one of three viewpoints. There's alot more functionality they could include, and I'm sure given their responses on their website forum, that they will include in future releases.
One of the requests was to sync it with either gCal or MobileMe/iCal and since Apple hasn't released the APIs for MobileMe syncing, gCal is the next best thing.

Here's the instructions on syncing on Google's webpage:
http://www.google.com/support/calendar/bin/answer.py?hl=en&answer=99358#