I've just added "my library" from Bibliophil.org See the button in the left column. I started with recent books discussed in our LitWits book circle. I intend to add more from that list and then add more of my bookshelf and then a wish list. I often hear about a book and say- I'd like to read that- and then forget about it. This way I won't forget! I guess it's my librarian background that makes this "fun" for me. Others might find it tedious and it does take a bit of time but I think readers of this blog may find it interesting to see what I am reading and compare my reviews with other readers of the same books. Not all books are for all readers and after a while I would think that if you see a reader who has similar tastes you could then see what they are reading and be confident that a certain book would suit you.
I chose the bibliophil program over the other jazzier one mainly because it was less commercial but I have to say the other one looked a bit more user friendly.