I think this is good idea, as many Mac owners are also Mac obsessed. The Apple logo is pretty trendy (far better than the Windows logo; I can't see that on clothes), and as long as the designs are nice, I forsee good sales. Nowadays when you look around in the juniors and younger men's sections of stores, you see lots of clothes with brand logos on them.
As I said though, to sell well, the design has to be perfect, and they also better make the items in sizes for women. If there's some baby t-shirts of tank tops, I can see teenage girls buying the items. So many girls at my school love to show off their ipod mini's, just because they are so trendy, so what's to stop them from wearing Apple clothes with very trendy logos and designs.
I personally would buy a t-shirt or polo shirt, but only if it was fitted and sized for women/juniors. And I would love some cool keychains, pens, etc. My dream item would be a glass paperweight in the shape of the Apple logo.
As for the naysayers, if this doesn't turn out to be successful, I don't think it would be a huge problem. They're obviously not going to have too large a supply, as the article says only a tiny space will be cleared out. I don't think stock prices are going to dip down too much if it doesn't work out.
If you click on the link, in today's news, right after the part about the logo merchandise being added, it also mentions that software is no longer going to be sold in Apple retail stores. At the closet Apple Store to me (Tampa), software took up a good amount of space, so I wonder what's going to replace it. Perhaps it will be this Apple Logo merchandise.,