I have 2 journals that I use to catalogue the physical books I own (one fiction and one non-fiction). I have another one where I list the books I have read per year. And another where I list the books I would like to read/purchase/borrow. I tried a journal for writing down notes about a book but that ended up being more hard work than it was worth.
They've got some other designs as well now. I might get a couple just to use as blank books. I figure it's a good cause and I deserve a little indulgence.