I have stood under a running 1.5 megawatt windmill in about a thirty mile per hour wind. There was not enough noise to worry about.
I would say that most of the noise is generated by interactions between multiple windmills, just like most of the noise a helicopter makes is a result of the interaction between rotors.

The problem is that the video had no sound - not ambient noise of any kind. And it appeared to be in very low wind conditions...

It may or may not create less noise, but it almost certainly has the same problems as other high solidity rotors, including vulnerability to high winds and interference in the air flow.

Deep in the bowels of NASA is a drawing of the ubiquitous huge 3 bladed fan. Dated 1946.
Hard to believe that there have been no advances in the past 65 years. And the politicians are on that nonsense bandwagon and those in Canada have incurred the wrath of the voting populace then they iced up last winter and were shut down. Take their initial low efficiency and slice that in half you then you might get it.
The problem is that the blades are designed as wings meant to fly. But time and again we have seen that the best performers operate on another principle called resistance. Spinnakers operate quite differently in principle than mainsails.
Resistance is the answer as we see here and in the Honeywell Design by Windtronics.
But no one has matched the efficiency in design of Bill Allison who achieved the Betz Limit of 59%. And Allison\'s fans were very quiet.
Here we also see what Bill discovered the inner 1/3 is useless in extracting energy.
All three, Allison, Windtronics, and Eco Whisper are made of metal. Allison insisted in stainless steel for strength and weather resistance. Bills test confirmed that dead flat highly polished blades extracted the greatest amount of energy.
Amazing that no academic institution has established a testing facility to compare and determine which design is actually the most efficient.
Unless things have changed since I went to school efficiency is the holy grail.
Bill Dickens

re; Island Architect
Do you really believe that all the big wind energy companies haven\'t looked at Bill Allison\'s data and found it wanting.

Oh good, a new and improved ... bird blender.

re; Bob Komarek
The actual number of birds killed by windmills is lower by an order of magnitude than the official numbers.

Slowburn,
It\'s easier for some people to believe in a conspiracy than to admit that the concepts they love don\'t work.

Wind power works! It is not the stand alone solution to all power needs, but makes a usefull addition. The old technology\'s have given us a golden age that, like it or not, is at an end!

I\'d like to see production of smaller scale wind generators for domestic use. The Australian government has spent huge sums of money to encourage the installation of domestic solar systems with grid connecting inverters. Would be nice to have a similar option with wind. Even without government grants, if this was priced well I\'m sure it would have high adoption rates. Sadly no one seems to be driving the domestic uptake of wind systems. Of course there needs to be more political will to encourage it\'s adoption. But without the availability of off-the-shelf systems customised for domestic installs, we are behind the 8-ball. What is likely the biggest obstacle will be council regulations. If these are indeed on the quieter side and small enough not to be an eyesore they should be widely adopted.