Dude! Relax! MacBooks are designed to last and endure much harder blows than that! My girlfriend's Unibody MacBook fell from at least 5 feet flat on the floor (no it did not fall on a carpet, just solid floor) and has not a single scratch nor dent! Nothing! Enjoy your wonderful Mac!
Damn dude, how did that happen? Would suck to do that on your unibod MB.