I'm really into David Allen's Getting Things Done system.
There's a major problem with the system however if your work depends on your productivity: if you put too much pressure on yourself, your creativity dries up.
One way around this is to schedule less. I've found that if I clear my schedule, it's freeing and I get more done. I've still got deadlines, but because they're not in my face, so to speak, I don't feel pressured by them.
Try clearing your schedule, and see whether it works for you.
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