They aren't new.
They have been about a while. Mythbusters have even used them a couple of times.
(
OneSullenBrit *air sandwiches*, Mon 2 Feb 2009, 15:18,
Reply)
I've not seem em
and I don't watch telly, so I saw low youtube count and thought 'hmmm, shiny and new'
Still pretty cool
(
Hellzapoppin, Mon 2 Feb 2009, 15:21,
Reply)