bored at work!? what should i do?

Yes, there were times when i also feel bored at work especially when there is no action going on or when i already finished my daily activity early. I can't wait for the clock to strike 5pm so i could go home. I also log on my friendster account but since there is only 1 computer in our section and 3 people use that PC, my time surfing is limited. In addition, surfing the net would raise other people's eyebrow. So i dont let them catch me. What i do is i go to the canteen to eat snacks, go to other departments/buildings, write something on my notebook, photocopy books or just ask other people if they have some work for me to do so that i would not just sit idle in my desk.