Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

Build your own personal blimp

Skyacht

Skyacht Inc. is a little company formed in 2002 to create a new type of aircraft they call a "personal blimp." It's actually a motorized hot air balloon featuring a nylon fabric envelope over an aluminum and steel frame. The Skyacht measures an impressive 105 ft in length and 70 ft in diameter, with an open-air cockpit that seats two.

The unique thing about this enormous aircraft is its patented collapsible structure that can be easily  deflated and folded for storage, much like a hot air balloon. And -- like a balloon -- lift is provided by heated air rather than expensive and impractical helium or potentially explosive hydrogen.

Cockpit The Skyacht is currently undergoing tethered testing, with its first free flight scheduled for August 2006. The prototype is powered by a tail-mounted 24 HP gasoline engine that's capable of propelling this monster at a maximum speed of 12 mph (in other words, you'll need absolutely calm weather unless you want to float off on a moderately terrifying cross-country adventure).

Future plans call for the installation of electric propulsion, which should result in almost silent controlled flight -- an absolute dream. That said, I have an overwhelming desire to build a little biplane for an early morning strafing run.

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