Reading all this from my trusty dell mini 9 hackintosh, I cannot help but wonder how they could say such a thing.
To be honest, Os X is a very usable os for netbooks, in fact, the interface is much more easily tailored to a netbook than the hoooo so old looking xp. Furthermore it's stable and stays clean and sharp. I had an eeepc900ha running xp before, and found myself constantly reformating even though I was only using the computer for light stuff. Of course I was a bit OCD about the speed of my machine but in the end, xp simply gets sluggish too fast nowaday no matter how good and technically knowledgeable you are.
Also, the reduced number of application from Os X, an argument against the os that is forever revelant, doesnt matter because you wouldnt use these applications(aka games) on a netbook anyway. The remaining stuff is well suited for a small computer.
Apple is making a very big mistake here, I can understand them not wanting to cannibalize their Iphone/Ipod touch sales, but it just goes to show that they do not understand what a netbook is.
A netbook is simply an extension of your main computer. It is not suppose to take over your main computer and won't... They are flashy items, yes, flashy and then, what is more flashy than an apple netbook....
I am pretty sure that by putting out an Os X netbook, a 500 aluminium machine with a good multitouch trackpad and 10 inches screen with an ion chipset, it would probably lower their sales of Iphones/ipod touch but at the same time, more people would be able to appreciate the cleaness of Os X and I wouldn't be surprised to see their sale of main computers then increasing.
So, to sum it up, it is a very bad move by Apple, simply because the netbook segment is a market where they are able to compete all the way against microsoft, a market where the usual grudge against them are irrevalent and the good aspects of their computers very much more apparant in consequence.