Locks. Lock your bong/papers/w/e in the closet. Put your weed in something, lock THAT, then put THAT in the closet. Each lock is one more oppurtunity for you to realize that you're being a lazy bum and that you're trying to quit. Trust me on this one.
Write it on your hand. Schedule some time for when you DO want to smoke, and look forward to that day.
A big prob is boredom. Find things you like to do. Books, sex, drinking, meditating, excersize, WHATEVER< just keep yourself busy. If you're like me, the first two weeks will be a boring dreary hell. Just get your mind off it.