It's worth noting that these kinds of magnets are >extremely< hazardous to small children. If more than one of them is swallowed, they stand a very good chance of sticking together through the walls of the intestine, causing all sorts of mayhem and blockage, and probably requiring surgery. I'm the last to be alarmist, but having these anywhere near small children are or may be is really a terrible idea.
I'm dismayed by the number of software upgrades that require new hardware. Why do I need to replace my Airport Extreme which was just released a few months ago and takes an external disk with this Time Capsule which has identical functionality, just to take advantage of a remote disk software update to Time Machine?!?
And why won't the new trackpad gestures be available on older Macbooks? They're multitouch-capable.
I can understand actual hardware upgrades that obsolete older hardware, but these software enhancements should be backported to at least the last round of existing hardware.