Been a long time coming that, but it begs the question why hasn't that been thought of before when its such a simple concept!
It's a solution to a problem i've never had.
Because it's not really needed!
At the very best case scenario, I can see a need for laptop users having one of these. But then most power supplies are bulky and get in the way anyway, so a standard 3-pin plug is hardly a problem.
As for everything else, what do you regularly plug and unplug? A hoover, maybe?
D.