i had my macbook unibody on a low table, open and on when i tripped on a plugged in USB cord. It dropped from a height of about 18 inches and hit my wood floor... with me screaming the whole time. (it was was like a slow motion movie) Miraculously, it seemed to be ok, no scratches or dents, and it kept on chugging and continued to play music. However, I am now super paranoid. I usually don't even like moving my computer when its on for fear of damaging the hard drive. I have had one too many hard drives die on me. Is there anything I should be cautious and on the lookout for? what might be the long term implications of my clumsy mistake?