Other practices?
1. Libraries will write in the gutter on the page where all the publisher's data is, as to the cost of the book and when and where acquired. I used to do that as well in my personal collection (but haven't bought in so long it's pointless to talk about it as an ongoing practice). Can be nice info to record though, and helps to answer some questions down the road.
2. Also, how many make a notation as to when you read the book?
3. And how many have been asked, when people see your library, "Have you read all these?"
The best answer, by the way, is "Some of them twice!"