I have yet to try out any book-reading software, but this looks like the killer social app that will convince me to choose Kindle rather than Nook. If the new Google book reader links tightly with Google+, as one would expect to happen soon, then I will commit to the Google product.

(I still read books the old-fashioned way, and my house is decorated in the Industrial Bookshelf style. One of the things I like best to do online is to discuss books and the ideas found in them.)

P.S. Thanks for the reply about Goodreads. I was an early adopter of Goodreads, starting an account at the suggestion of a friend in another state, but I stopped using it right away, because of its somewhat tedious interface, and no longer trust Goodreads at all since I saw Google results from searches on my name that included spurious Goodreads pages that appeared to promote books that I've never read. (I ego surf on the major search engines from time to time precisely to see what spoofing is being done in my name. I reported the Goodreads fake page problem to Google last year.) I do have friends who still like Goodreads a lot, but I'm thinking a tighter integration with an ebook reader has to be a beneficial feature for an online social network, and vice versa.