Even though I already know of more books I want to read than I have any chance of ever finishing, I'm always looking for more books to add to the list. What Should I Read Next? is another site helping me do that, and I thought I'd share.
How it works: You type in a title or author you like, click something from the results that best matches what you're looking for, and it spits out a list of recommendations based on registered users' favorites lists (a more detailed explanation can be found here). I haven't registered yet, but I tried searching a few authors and books I like, and the results usually seemed decent. I only wish the recommendations included annotations.
Play around with it, and remember that if we don't have whatever books it recommends, you can always request them via Interlibrary loan.