If you were to log in, you'd be able to get more information on your fellow community member.
I was about to write this comment when I read a posting of Ed Edgar, January 31, 2001 that essentially sais what I was going to say. Clicking first time on a reference to some book on photo.net, I did not expect to be thrown to amazon.com. I suspect that quite common expectation among people clicking on those links (first time at least) is to get some more information on the subject, but not to be offered to *buy* the book. The text of those links to the books on amazon.com seems to be off-harmony with the nice non-commercial environment they are in. The same thing would *not* be confusing if there were ads/offers/sales all around on a page.