No matter how convenient and cheap buying books online is, it’s just not the same as browsing in a bookstore.
However, I came across this site the other day that appears to be trying to recreate the bookstore experience. Zoomii pulls data from Amazon.com, and displays them as books on shelves. You can use the Categories link on the left menu bar to quickly go to the section you want.
It’s a bit slow, even over a broadband connection, and I think there is potential for additional features (I would love to have New Releases by genre, for instance). And it’s obviously only available for Amazon US (and Canada).
Despite all this though, I definitely think there is something there worth pursuing – I can see myself spending quite some time browsing these shelves online!