I wouldn't call mine a life list, per say. I have a book log of every book I read. Ii write reviews so this helps keep everything in line. Every time, I buy a book the first thing I do is log it down. It doesn't matter what book it is. I've even started a book log for my girls. Our latest entry was all four of the "Twilight" series. by author Stephanie Meyers. I haven't read them myself with working on another review and getting ready for a contest.
My girls say it's a good series( their 16-11) and their addicted to the title character Edward Cullens or it could be the actor who plays him.
But I do see what you mean about books being a life list or even a time line of where you were to where you are right now.
Happy Reading