I've got to recommend exactly the opposite of this, but it may depend on what time of problem you're having with productivity.
Do you have many projects and have a hard time motivating to complete them? Force yourself to limit them and finish them before starting something new. Record any new ideas in the meantime in a simple document.
Do you have nothing going on and always wish you had a project to work on? It may be a good idea for you to try a variety of different side projects and see what sticks as ignifero suggested.
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Get the habit of starting a new side ("weekend") project every 2-3 weeks.
I've got to recommend exactly the opposite of this, but it may depend on what time of problem you're having with productivity.
Do you have many projects and have a hard time motivating to complete them? Force yourself to limit them and finish them before starting something new. Record any new ideas in the meantime in a simple document.
Do you have nothing going on and always wish you had a project to work on? It may be a good idea for you to try a variety of different side projects and see what sticks as ignifero suggested.