If you were to log in, you'd be able to get more information on your fellow community member.
Just wondering: What happens if instead of just linking to the book (Kodak Photoguide, say) from Amazon.com each time, you put something like "the [Kodak Photoguide or whatever] book at Amazon.com"? I only ask because earlier I clicked on one of your links to Amazon.com thinking it would take me to another site with some free online content, rather than one that was trying to sell me a book. (I didn't stay at Amazon.com long after that...) I guess you could get some idea how much this was happening by looking at your access logs. Of the 2000-and-some people you sent to Amazon.com, what proportion came back to your site a second or two later?