That particular link is not correct. There are plenty of ways to make "free energy" but that isn't one of them.
As the story goes, this video was released after a patent was filed...
http://www.youtube.com/watch?v=PFGiWiXMHn0 --- inventor promptly vanished never to be heard from again.
And here's a replica that took 6 years to build based on the first video and the patent for the that one.
http://www.youtube.com/watch?v=fqJDrFMqGlUThis concept involves using magnetic repulsion (and tactical blocking of the leading edge of the field) to make it spin until it either accelerates to the point where the bearings wear out... it shakes itself apart or the magnets literally fall apart and turn to dust from the field interactions. It works well enough, but the cost effectiveness of it is iffy at best (the general assumption is that parts wear out too quickly to make enough return before you have to stop it and replace parts).
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There's a very interesting coil arrangement called a rodin coil (or star drive coil or starship coil) the interesting effect is that at certain places inside the fields generated by the coil there is enough incidental flux to power diode (or any uni-directional circuit) wirelessly - with no additional loss to the process already going on in the coil. There are literally dozens of people who've made the coils and simply drop handfuls of leds into the flux areas and watch them light up... while monitoring the draws across the coil and showing no loss.
AFAIK there's no serious research into making any sort of generator chain using this tech... I believe the primary issue is that you'd have to be willing to move huge amount of amperage through the coils at some point to produce this wierd effect... and the sheer cost of the materials gets prohibitive rather quickly.
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There's plenty of people making DIY solar powered stirling engines (using focusing plexiglass to heat the hot side of a stirling piston) - that work even in extremely cold environments... as of yet - no computer controlled consumer products on the market. It's all done with a human focusing the lenses.
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There's something called a tesla-cable-generator... (yes it's an old tesla patent) that describes how running many meters of insulated cable can harvest current from the em field of the earth - the only reason it hasn't been developed commercially is because of lawsuits where power companies went after citizens using them claiming they were using induction to steal electricity from the lines... Since then everyone's pretty much left it alone.
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And my personal favorite... Browns gas generators. There's one commercial product that will turn distilled water into browns gas (it's an unstable molecular reconfiguration of HOH into HHO) hydrogen is aproximately 250 times more explosive than gasoline - and browns gas is aproximately 3500 times more explosive than hydrogen. I know one guy in particular that uses a modified browns gas welder running off house current to power a steam engine to charge the batteries that run his house. Seems like a lot of work to me... but man it's cool.
I don't know of any commercial internal combustion engines that are designed to run purely off uncompressed hydrogen... but it's conceivable that it would be possible to design such... and that if you could build one to run browns gas instead you'd see massive amounts of 'free energy'
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Ultimately when it comes right down to it... the cheap and easy free energy is solar and hydro. You can build it yourself and it's pretty reliable. Hydro is of course best (but requires running water) - solar is climate (and time of day specific) but the stirling engine running off focused sunlight may ultimately make even low light or bad light capable of making good reliable power.
