3. Don't contact her
After the relationship reaches finality, you have to break off contact or you will go mad. Don't beg or cry. Don't drunk-dial. Don't write her email. Don't send packages or CDs. Don't dedicate a song to her on the radio. Get the picture? She will find you if she wants to. And even if you can talk your way back into her arms, it's only a temporary reprieve. She already knows you want her back, and she doesn't care. Take that as a sign.
4. Get negative feelings out on paper
Write her a letter pouring out your negative and weepy feelings, then disassociate them from yourself. Throw the letter away or burn it. But definitely don't send it to her. You will only regret it. She will show her friends and her new boyfriend. And they will all share a good laugh.
5. Avoid her friends and the places she hangs
Don't venture into her territory. You won't be welcome. Find new places to hang out for the first few months, and make new friends if necessary. If any of your friends insist on maintaining contact with her, you may have to shut them out too -- at least temporarily. After some time has passed, you should go back to living normally, and that means hanging out at these places and reconnecting with mutual friends.
6. Throw away anything that reminds you of her
You don't have to burn it all, but definitely get pictures, gifts, clothing, letters and email out of your living area, or at least out of your line of vision. If that means giving away roughly half of your wardrobe to get rid of the memory of her, so be it. As a rule of thumb, if the object reminds you of your ex, discard it. This can save your sanity.