[Toadling]

I do this: if it must happen at a specific date/time, then it goes in iCal, otherwise it goes in OmniFocus. I believe this is what David Allen recommends.

Some examples:

1) If I need a haircut, the action goes in OmniFocus. However, if I have an appointment for Thursday at 12:30 PM, then it goes in iCal instead.

2) I try to mow the lawn every Sunday afternoon, but if I miss a week, or end up doing it on Saturday instead, it doesn't really matter. So that goes in OmniFocus as a repeating action based on completion date (it starts every 5 days, giving me a couple days lead time to allow me to cut the grass early if I want).

3) Garbage pickup in my neighborhood is every Tuesday morning, so I absolutely must get the trash out Monday. But it doesn't really matter what time on Monday, so it goes in iCal as a repeating, all day event on Mondays.

4) In your example, it sounds like you have a conference call scheduled for a specific date and time. In my system, that would go in iCal.

Hope this helps.