Just a data point: last night I went to buy some music online, and wasn’t exactly sure where to buy it. I don’t buy music online much, so I have no brand allegiance. I was predisposed not to buy from Amazon.com, because I thought that they should stick to books. I checked out CDNOW and Tunes.com, but wound up buying from Amazon anyway, because they have more information about the CDs. I wanted to buy an Old 97s CD and wasn’t sure which one to buy, and the revies at Amazon.com helped me make a decision, so I added the CD to my shopping cart there.