3.

My favourite book sites:

• Amazon.com - because after you've checked 'I own it' on books & rated them or added books to your wishlist (which is also handy for keeping track of what you want to read), it recommends books to you based on what you've shown interest in.
• BookMooch - I've sent two or three of my books away so far and have gotten one - I'm also waiting on one. All you have to do is pay for the postage of yours, and the further away you send, the more points you receive to 'mooch' books from others.
• Shelfari - lets you keep lists of what you've read, are reading and plan to read. You can also read others' reviews or rate and review yourself. I'm a bit obsessive with list-keeping, I've noticed in writing this post, but as I hate to be without a book, having a list of books I've already given the nod to is really useful.
• What Should I Read Next - can do the same kind of thing as Amazon's 'recommended for you' except instead of basing they recommendations of a wide and somewhat inspecific range of products, you enter the name of a book you've liked and it gives you a list of other books you might enjoy, as well as the links to their pages on Amazon.
• Whichbook - lets you choose what kind of 'mood' of book you're looking for (e.g. 'happy' or more 'sad? 'no sex' or 'sex'?) and then gives you a list based on your choices. You can also choose based on location, main character or plot.

Also, the library service in my city has a database of its books online - I'm able to search for them and request them to be transferred to my local library for me to pick it up. It makes borrowing so much easier - they shelve them in a special area with my name on a slip inside :3. Definitely check out if your library service does likewise. I use the above lists to find what I want to request!