Hi  guys, this is the first time i posted in here.
I've read few threads about free energy. There are few conditions to generate free energy : unlimited source of energy or build most efficient  machine.
I choose to build the most efficiency machine, started with how to create electricity.
I coil a wire (thickness 0,3 mm, 15 warps), and using 10 neodyium magnet (2x1,5x0,5 cm).
http://i469.photobucket.com/albums/rr53/ficelo/1-1.jpg
The video :
http://www.youtube.com/watch?v=YiyD-PnA6GU

The result
1) Then the magnet pass through the coil of wire, it generate 0.001-0.003 volt. (This is exactly the same way alternator, motor, dynamo, and  generator  work)
http://i469.photobucket.com/albums/rr53/ficelo/2.jpg

(2) Most interesting part is when magnet go into the coil of wire, it generate 0.005-0.028 volt.
http://i469.photobucket.com/albums/rr53/ficelo/3-1.jpg

It means the second method can generate 9 times than the first method. (if the number of magnets and coil of wire same in first and second method). If you don't believe it, you can try it by yourself.

Then it’s time to be creative. To get those advantage 9 times output, the system must used the motor (AC/DC) as the initial source power, then the output from motor (rotation motion), convert into forward and backward motion (like a piston)
http://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Piston.gif/527px-Piston.gif

Then I create this system
http://i469.photobucket.com/albums/rr53/ficelo/4.jpg

But my project not yet done, because there's a problem, the system make the motor work unbalanced, so it shake very roughly.. :[

Here is my assumes, when the motor (1/2 HP) need input 375 watt, the output maybe around 250 watt ---> if it convert to generator (efficiency 70%). Then from output motor become input to piston. If there’s a loss, (my estimation) input to piston around 100 watt. Then the final output from the piston around 900 watt.

this is for example..
http://www.otherpower.com/images/pmg17.jpg
this system using hand drill as the input. the hand drill need 770 watt, and the output from generator is 300 watt, because the magnet rotate pass through the coil.. if the system like piston motion, i believed the output at least around 2500 watt.. (with the same magnet and the same coil of wire)

nb : I'm an Indonesian, sorry if my english is not too good

Clever concept, please keep us posted of your progress.