It's taken a long time since that 2005 patent was filed for, but Raymond Li is now finally ready to bring his water-propelled jetpack to the money-spending world. Nailing down a March 2011 launch date and a price of $99,500 hasn't been easy for the inventor, who says his efforts to procure capital and prototyping quotations were mostly met with incredulity -- "almost everyone thought I was crazy." His JetLev personal transporter relies on an engine and fuel tank (which remain on the water's surface) to pump H20 into a backpack that then shoots out streams of the drinkable stuff to keep your airborne. Top speed is 22MPH, max height is nearly 33 feet, and the fun factor is somewhere off the scale, whether you're talking metric or imperial. Levitate past the break for a video demonstration.[Thanks, Suraj]