Now is a great time to start a log of all those books you've been reading.
This will help keep that growing book stash in order. And will be a great reference down the line.
Any journal will work. Make sure you leave enough room to log the Title, Author, Plot, What you liked about it, What you didn't like.
Feel free to decorate the book any way you like (or buy a beautiful one that needs no work) :)
TIP: This will come especially handy when your best friend asks "So, read any good books lately?"