I have a journal broken down by month/year of what books I've read and if I liked it or not. I was buying duplicates of books I already had or had read.
I also keep a list of books I want to read. When I have a book from the list, then I cross it off. After I finish the book it goes to the above list.
I also keep a list of books I want to read. When I have a book from the list, then I cross it off. After I finish the book it goes to the above list.