Booktagger - Your Online Book Collection

Booktagger - Your Online Book Collection. It says of itself: "Tired of cruising book stores trying to judge a book by its cover? Now you can ask those who've read it before. Booktagger is an online bookshelf application to list the books you've read and to share them with others." Why not try LibraryThing, Shelfari, LibGuru, Bookjetty? This is really getting stupid now - you can maybe get away with having a couple of these resources, but does anyone think that yet another of these is going to make the grade? I thought it was stupid enough when Bookjetty turned up, but this is nuts.