Let me get a bit philosophical here:
There are only 7 principles that can´t be broken (if they does, please explain me how, cause till now I could not find an exception) :
1 Principle of Mentalism
2 Principle of Correspondence
3 Principle of Vibration
4 Principle of Polarity
5 Principle of Rhythm
6 Principle of Cause and Effect
7 Principle of Gender
http://en.wikipedia.org/wiki/Kybalion
http://www.gnostic.org/kybalionhtm/kybalion.htm
As Mikey_S said, some rules (like thermodynamics) may break down at the sub-atomic level, but thats another field of action. Even at sub-atomic levels the 7 principles work.
I personally think that the "big bang" was just a point where entropy -and universe- passed to the other side of the scale, like if it was a sinusoid (vibrating with a certain rythm )
Now, down to earth!
We could got as close to perpetual motion as a 60% of the scale generating energy (serach in this thread for combined cycle) but then that is ruined to 30 or 40% again when we use and transport (superconductivity! someone?) that energy.
So, Chris: there is a long way to go!
PD: Please note that at least I don´t hate you, as I don´t like to generalize. I can´t even blame the bunch of blind people who does not know what is happening outside of the USA, cause that´s the way it was planned by government and friends (for more information, watching the 2nd and 3rd part of the public domain movie "Zeitgeist" http://zeitgeistmovie.com/ would be nice)
I know there are plenty of good American people, as also there are "bad" (and this is generalizing, which I don´t like ) non-american people. Aftert all, there is only one planet earth