Develop Perfect Pitch

Not as hard as it sounds...  One of my music teachers told me that all you have to do is carry a tuning-fork in your pocket for a couple of weeks.  Every couple of hours or so, rap the fork and hold it up to your ear and match the pitch with your voice.  After a week or less, just bang the fork but don't bring it to your ear... you'll be able to match it on your own.  Pretty soon you won't need the fork at all to find that A-440hz note.  Of course, I've yet to complete this practice so I shouldn't be saying anything...  it's just a goal okay...