I just added a virtual bookshelf on Facebook. What a great application! People can look at my books (you need to add me as a Facebook friend) and I can look at yours.
Some of the books I hoped to be able to put on the virtual bookshelf aren't available through Amazon yet (a prerequisite), but I was pleased to find Hella S. Haasse's In a Dark Wood Wandering there. Great story to go with it too. She wrote it in Dutch, years ago (1949), and sent it off to a translator. But she was too shy to follow the matter up, and her (untranslated) manuscript was found in one of the man's cupboards when he died—some 45 years after she'd posted it to him.
So they translated it and published it. Well worth the wait. Agincourt, Joan of Arc plays a minor role, French medieval politics, romance...top stuff.