Over the years, I've developed a pretty involved productivity system. It was originally based on Getting Things Done, but now it's grown to include the good bits from other systems. It's involved, but I love it.
I get a lot of comments, especially on the little black book I keep in my back pocket. I hear people say they want to get organized so they can be more productive, but I think that misses the mark.
Getting organized may make you more productive, but the real benefit is that getting organized makes you less stressed.
The intro to "Getting Things Done" does a great job of explaining this. The gist is that filling your consciousness with list of things you have to do later distracts from what you're doing now. Irrelevant stuff keeps popping into your head and causing stress.
Instead of trying to remember all the stuff you need to do, build a trusted system that will remember for you. Then all you need to do is set up a few habits to remind you to look at your system. Your brain is bad at remembering, but it's good at habits.
For the past few years, my main goal has been increasing how much I enjoy my work. Cutting the stress out of my workday was a huge improvement to my work satisfaction. If you're feeling stressed or burnt out, I highly recommend looking at whether a productivity system would help.