Objectives have been useful, but I've noticed recently that I've had a few tasks that at the time weren't part of a larger objective, but now are (e.g. I had been to a couple of meetings about an event, but then ended up taking on the planning of that event, which became an objective). At the moment, I cannot locate a way to add items from weeks previous to where the objective is created, although you can extend the objective forward. Being able to add past tasks to a newer objective would be useful (and work with some of the other suggestions about longer term objectives).