I took from all my Lunux experience straightly follows that it is a more power sucker than Windows on comparable tasks. and had some thoughts about possible causes.

In regards to Windows, open source left them in the dust long ago. Microsoft is playing catch up but they'll continue to fall farther behind despite their efforts. Take a look at Vista.
I would not know about left them in the dust long ago In my world "left in the dust" means lost market share.
Re Vista, if you read my post above Then the gatesians come out with Vista that require 4 times more MIPS for a performance .....you will see that I am, by no means Bills favorite customer.

You seem, at times to make me a Windows lover/Linux hater, I am neither, just a buyer of the workbench on which the best tools the types of which I need (which, alas, are not open source) perform.

one final comment:
2) Open source projects of significance gain from the knowledge and experience of a world wide pool of talent
That pool is very small for limited use programs. Just think about the following: I have no idea how much 'talent' is involved with SDCC, but have, so far only seen one in this forum and I am fairly certain that Keil has more employees than the number of 'talents' seriously involved with SDCC. By "seriously involved" I mean working to improve, if 'involved' means contacting a 'talent' re a problem, that is no different from contacting Keil tech support. Now, of course, if you, instead of the '51 think PC the story changes dramatically. The "world wide pool of talent" that a) are qualified to program a PC and b) use a PC program called (if I recall) GCC does, of course make your arguments more valid in that case.

Were we to discuss Windows/Linux on an "office cmputer" we would be a lot closer in our opinions, then it would be "the ability to hire personnel familiar with the applications" and, again, we are back to market share.

off topic
Have you ever thought about what the typical desktop would look like today, if Apple, like IBM had opened their PC design for everybody and his brother to copy.

Erik