I found this site recently librarything.com . Here you can catalog your book collection and find out how many people own the same books you do--or even discover some great books you never heard of. I've listed about 10 percent of my books so far in case you want to look. Here's the link to my book shelf: http://www.librarything.com/catalog.php?view=jimflint1 I'll be posting about this again when I've completed (at least currently) the cataloging of my collection.