I like the way OF works with iCal.
I have a set of actions that sync across to iCal, some with start dates a couple of weeks before the due date.
When in iCal planning my week I can drag the to-do multiple times into the spaces between meetings, so that I progress the action through the week.
I have to set some "hard" time for some of these actions otherwise they never get done...

when the action is complete, then tick it in iCal and OF deals with it.

Cheers
Paul