I can't speak highly enough of Replug, a breakaway audio jack adapter which resembles Apple's MagSafe plug. I just tripped over my headphone cable while my MacBook was copying files and it could have been disastrous. Luckily, Replug let go and my MacBook didn't go flying off the table or get its hard drive jerked while writing to the disk. I figured I'd post about it out of gratitude because everybody should know about this simple yet essential accessory. Cheers.