Did you see www.jetlev-flyer.com ? I'm going to hope this comment isn't annoyingly off-topic for this thread on the grounds that the JetLev is a personal jet-pack for the 21st century (despite its obvious limitations, you can fly from Florida to the Bahamas with it, which you couldn't say about any other jet pack), and because the first video has a nice use of Thus Spake Zarathrusta (2001 theme music = 21st century reference and ObSF).