Since 2007, I've been tracking the books I read. I note the author, number of pages, type of book, and how much I liked the book on a scale of 1-4 in a spreadsheet. Since the beginning of 2007, I've read 54,864 recorded pages. I'm not bragging since many of these were graphic novels and plenty of people read more than I do -- just an interesting number.
I like Scott Stein's idea of saving the book's cover for a more visual record.
Here is my 2012 in books: