I have used Library Thing for a segment of my personal library. I love the ease of use, the full cataloging, seeing who else has the same books I do, and looking at other collections.
I am very taken with the use of Library Thing by libraries (e.g., new books, book clubs, etc) and am wondering if it might be an option for smaller church libraries.
I did see in a Library Thing discussion group that there were church libraries who reported success with it.
I think getting the book covers is really cool!