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.
Comments
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.