I’ve not had any luck in getting MobileMe to push iCal events to my iPhone. I’ve created events on my desktop and synced them to the MobileMe. The events will show up on the other computers in my “cloud”, but the events don’t get pushed to the iPhone. They only show up after I’ve manually synced the phone to my computer.
It doesn’t seem like there’s a way to force the Calendar app to sync with the MobileMe cloud to update the data.
I hope they get the bugs in MobileMe worked out soon.
UPDATE: Fixed my problem! My iPhone settings weren’t correct for iPhone iCal sync.