I can vouch for this. I recently started doing pomodoro and it has changed my work life completely. I usually find I can get done in 5-6 hours what used to take me 9+. Then I can take off the rest of the day, read HN, play around with other tech or just relax.

Something he didn't mention is having your activity list(stuff you need to do) which you use to make your todo list of items that you think you can finish for the day. From this list you pick the most important item and start working on just that. I was surprised at the razor-like focus you gain from this by just getting that one thing done.

Often, you'll come across other tasks that need finishing while working. Instead of distracting you, you just put them on your activity list for later and keep going.

Another nice thing about this technique that you really should practice is keeping records on the the amount of pomodoros you do each day, the distractions(external or internal) etc. These are then used to gather metrics you can use to analyse and optimise problem areas in your productivity.