Thanks. I was relying on book lovers' desire to "show-off" about how well read they (we) are.
I started using Amazon, but when I started thinking about adding badges and it would need the book database to be very specific about authors/genres/titles, (which Amazon's wasn't) I realized it was way out of my league.
Just curious - why not utilize Amazon's book database, since that is likely how you'd make your money anyway (via referral fees)?