This has to be one of the coolest things I've ever seen for library keepers. A community of cataloguers. I found the site at Elena's (My Domestic Church) and am contemplating spending the enormous sum of $10 to catalogue as many books as I wish for as long as the owner keeps the site up.
Below is, I hope a blog-widget that gives a sense of what is so very cool about what's happening here.
Oh, and you can craft the widget to display what you want it to display--random books, most frequent authors, etc. Really, nice.