And when on the receiving end of the deliverables list, it's always a good idea to make sure they are actually deliverable.

There's nothing worse than a task where you can deliver one item and then have to rely on someone else to be able to deliver a second. Was once in a role where performance was judged on closing tasks; getting the burn-down chart to 0, and also having it nicely stepped. Was given a good tip to make sure each task had one deliverable and where possible—be completed independent of any other task.