Publishers Weekly compares three book cataloguing sites: LibraryThing.com, Shelfari.com and GoodReads.com. These sites allow users to keyword tag and comment on books they own or have read. The oldest of the sites, LibraryThing, has been around for a couple of years — a long time in internet terms — and publishers and book retailers are finally beginning to take an interest, either by investing in the sites or by providing members with advance review copies of forthcoming titles.
The PW article tries to make distinctions between the three services (the unfortunately named LibraryThing has by far the most members) but for me largely fails to do so at the user level. Below are screen shots of the sites’ intro pages.