I have a new widget up for Library Thing. I joined Shelfari not long after I started blogging but I never used it much. I read a lot of books -- mainly from the library -- and the thought of entering all of them, never mind reviewing, was kind of exhausting, so mainly I just ignored it, or only updated it with books that were particularly important to me. I did kind of envy those cool "Random Books from my Library" widgets I saw on other people's blogs, however, and so I finally kicked myself into going to Library Thing and signing up.
Unlike Shelfari or Goodreads, Library Thing is more focused on books you own (though you can make a category for books you've read but don't own.) And a library -- the books you've collected over a lifetime -- gives a slightly different picture of who you are as a reader. I have books in my library that belonged to my parents. I have favorite authors from my high school days. I have cheap paperbacks from book swaps. I have textbooks, home-repair manuals, cookbooks, and a guide to the major festivals of Japan.
A library, like a diary, is only a partial reflection of who you are. A lot of my recent interests aren't represented because I don't buy as many books as I used to for lack of space. But I'm looking forward to using Library Thing more than I used Shelfari, and getting to know the community there.