For those who are wondering if keyboard shortcuts will help them improve productivity, you should not think twice. I use keyboard shortcuts more than mouse as it improves my time which results in improved productivity.
Just imagine all kind of cool things you can do with keyboard shortcuts like minimizing the window of your keyboard, send buzz to your friends if you are on yahoo messenger, shortcut to maximize screen via keyboard and a lot more. There are some funny key board shortcuts like inverting you screen and with such keyboard shortcuts you can play pranks on your friends.
I have compiled a list of more than 500 such useful keyboard shortcuts which you can put in practice.
Hope this helps your productivity the way it helped me.
Related post: Keyboard shortcuts to stay productive.