I LOVED the idea, and I took it to use in my classroom.
Each student is assigned a space on our "What Are You Reading?" Board.
They have an index card and a small binding ring (you know, the silver ones that open and close to hold things).
These are hanging above my library...keeping everything "reading" together ;)
When a student begins a new book, he writes the title of the book, the author, and draw a picture dealing with the first few chapters on the front of the index card.
The students have really taken to this way of recording their reading. They use their "May Do" time during Independent Work Time to fill in new cards, complete old cards, or just browse the cards of their fellow students. At this point in the year, they each have about 5 cards on their ring. We can only hope to get to our goal of 20 cards (representing 20 books) each by the end of the year!