I find this fairly scary. 

I find this fairly scary.  I think if you can go in with a subpoena, gathering this information is probably alright.  I guess its time for me to quit using amazon and start paying for books in cash.  I don’t use Supermarket Discount / Rewards Cards for the same reason.  Is this still America? Where the Feds can legally demand to see which books you purchase? [Adam Curry: CurryDotCom]