quick thing you can do to boost your productivity:
Make your default browser homepage blank.
So you won’t be tempted to do something else when you open a browser to accomplish a task.
people who have their browser default page MyYahoo or MSNBC are in for a productivity suck as they will be likely drawn to an interesting news article every time they open a browser instance.
better yet: default your homepage to your BackPack account homepage, and get started on your next todo item.
(see http://www.backpackit.com by 37 Signals for more info)