Social Personal Library Catalogues

The Librarytwopointzero blog has a good post about social cataloguing tools. Check it out here.
Do you know these tools? Have you set up a group for your community or book club??
There are about two dozen listed in the Wikipedia entry on social cataloguing tools and applications.
LibraryThing has some competitors and imitators! See the list below for some creative names too. You can link to them through the Wikipedia entry.
Books, DVD’s, etc.
Bibliophil.org
Bokhyllan.com
BooksWellRead.com
Chainreading.com
ConnectViaBooks.com
LibraryThing
Reader2.com
DVDAficionado.com
DVDSpot.com
Matchflick.com
Origons.com
Squirl
Douban.com
Douban.net
GuruLib
lib.rario.us
Listal
Mediachest
Socialogue.com
Stuffopolis
CiteULike
Bibster
AllConsuming.net
Last.fm
Rateyourmusic.com
Anyway, there is some new stuff to learn here. Have fun surfing.
Stephen