Unlimited cheap, clean power.

This has been covered before on CR4 here (short answer it doesn't produce as much or more power than is required for the radio waves and never will).

http://cr4.globalspec.com/thread/9309/Salt-Water-as-Fuel

Sound has been investigated however as a chemical-free form of water purification.

Powered flight does not violate the laws of thermodynamics.

An overunity power scheme does.

"Q.How does anything get accomplished if everyone says it's impossible"

There are a few things in the fields of science that are for sure, undeniable, and absolute.

People have tried every which way to defeat the Laws of Thermodynamics since the dawn of man, and not one of them has succeeded. There is a simple reason for this, which is perfectly explained in many textbooks focusing on Physics/Chemistry/Engineering. If someone does create a method which indeed does violate these Simple laws, they will have found the #1 largest impact to the human species since Man controlled fire.

I think the world needs people who are willing to spend untold amounts of time and money trying to violate the basic laws of our natural planet. Some of those people might stumble across something else on accident that may have an actual application, but unfortunately, All the rest will have simply wasted their time and money. Don't get me wrong, We absolutely need tinkerers, inventors, and backyard Engineers who attempt to violate the basic rules of science, but they should not be supprised that they might get a response from Actual, Professional, Experienced Engineers/Scientists, which is not what they wanted to hear.

You cannot for a millisecond believe that you can approach a bunch of Highly educated, experienced, Engineers/Scientists, and expect them to substantiate something that so simply violates the laws that every aspect of science is based upon.

For your own reference, here are the 3 basic fundamental laws of Thermodynamics:

1. The first law of thermodynamics is often called the Law of Conservation of Energy. This law suggests that energy can be transferred from one system to another in many forms. Also, it can not be created or destroyed. Thus, the total amount of energy available in the Universe is constant.

2. The second law States That heat cannot be transferred from a colder to a hotter body. As a result of this fact of thermodynamics, natural processes that involve energy transfer must have one direction, and all natural processes are irreversible. This law also predicts that the entropy of an isolated system always increases with time.

3. The third law of thermodynamics states that if all the thermal motion of molecules (kinetic energy) could be removed, a state called absolute zero would occur. Absolute zero results in a temperature of 0 Kelvins or -273.15° Celsius.

There is one more (newer law) that is called the Zeroth Law, and it states that if system A and system B are in thermal equilibrium with system C, then system A is in thermal equilibrium with system B.