So, this guy "can't give away" his copy of Windows 7. What does it prove? Absolutely nothing.
For those who don't want to follow the link, here's the summary: an editor at a technology magazine had an extra copy of Windows 7, and had difficulty selling it in various venues. His conclusion? Windows 7 must not be a hot commodity after all.
That article is a sterling example of shoddy thinking. He takes one example -- his own experience -- and extrapolates industry trends from it. That's like me saying that my iPhone crashed when I loaded a new application on it, so all iPhones stink, and the apps written for it are garbage.
I love how all the data show that Windows 7 uptake is roaring along (and it's not all from Microsoft's internal sales figures, either), but because this guy couldn't sell his copy for more than $50 (and he did sell it, by the way, so he did more than "give it away") is solid evidence that all the data is somehow wrong.
Now, this doesn't mean that Windows 7 sales will slow, or that Microsoft is hyping the numbers somehow. Both of those could be true. But to assume that your single experience somehow discounts all available evidence to the contrary is hubris in the extreme.
Remember: You can't believe everything you read on the Internet.