beyond method 5

What a great tool!  Although I often reread books because I love them, I sometime reread them because I don't remember until I've finished chapter 1 that I have already read it.  I think that this would be a great personal tool for me.  I'm not sure about using it in the library - I can see using it when certain classes come in looking for book report books by genre, and it would be a good place for student reviews (I'm not sure how that would work though).  The biggest drawback would be the time factor.