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I only want a Notebook that wights less than a 1kg (2.2lbs?)
I doubt you'll see that. It's quite difficult to get a decently performing system with screen and all the chassis components (although much easier if you can remove hard disks and use onboard NAND flash) at a REASONABLE and usable size (9"+) where it comes in that light.
A couple of examples, the HP Mini 1000 weighs 2.8lbs. The EeePC 1000 is 3.19 lbs. Contrast the original 7" EeePC which was less than 900 grams, had a processor not worth the effort of turning on, a tiny low-resolution screen framed by a 1.5 inch border, and a keyboard you need to be a pygmy to operate.
The MacBook Air weighs 3lbs, the MacBook weighs 4.2lbs or thereabouts. The MacBook Air costs $799 more and has fewer features and lower performance.
In all honesty weight is not that much of an issue as long as it hovers around the 3lb mark. I think this is a noble goal - no heavier than the Air or EeePC, but not too light as to be derived from stripping it of technology and features.