My friend Jeff created this snap off safety power plug for laptops that mimics the magnetic safety power plug used by Apple - but avoids any IP claims. Clever. It consists of a small adapter that contains the snap away socket and the plug that goes into your laptop, so you can use it with any compatible laptop with a 7.4mm plug. They've got a kickstarter program going to put it into production.
View Link [chargesafeconnector.com]