Could you make the site usable by people who don't want to sign in? Pandora had a feature where you enter one song, and they tell you what they'd recommend. Th

Could you make the site usable by people who don't want to sign in? Pandora had a feature where you enter one song, and they tell you what they'd recommend. That intrigued me enough to sign up. That might be useful for BookLamp too.