[whpalmer4]

Also, depending on your settings for how often calendar data on the iPhone is refreshed, you may not get an instantaneous change on the iPhone, even though the OmniFocus software on the iPhone is what changed the calendar! If the iPhone calendar app is only fetching that data every 15 minutes, and you add a last minute action with a due date in the next few minutes, there's a reasonable chance that the due date will arrive before the iPhone calendar app knows about the reminder. For this reason, even though I usually get very speedy response from this setup with MobileMe and push enabled, if I need an alert for something that is going to happen in the next 30 minutes or so, I use the Clock app to give me an (additional) alert. Most of the time I'm setting due dates at the least a few hours away, if not days, so it isn't a concern. However, if you're just trying out the feature, it's easy to run afoul of this because who wants to wait around for half an hour for their test alarm?