To start with, if you are planning on using the following methods to the extreme, then your job is not for you, face it, you're bored out of your brain, go find something to do that stimulates you!
These methods are tried and tested and will already to known to the majority of office workers. However, if you are only just entering the exciting world of administrative work, or simply feel you need to tune your time wasting abilities then read on. I'd also like to add that if carried out to the letter you will not lose your job.
A 9am to 5pm job with an hour for lunch. That's 7 hours of pure work your employer would have you do, that's 420 minutes people! Let's get this figure down.