I have a small collection of programming/technology books, some from O'Reilly, others from Manning and No Starch Press. I've read them and they have been very helpful, but I will admit that I been buying less books. They take up space, and my shelves are full of these and other books like novels and manga.

Also, now when I am trying to learn a language, I just work on a project and search in the docs (or just on Kagi) to find what I am trying to do. Maybe a physical book would be a quicker reference, and maybe I should buy some more of them.

P.S. I enjoy finding old computer books (like DOS/Win95 era) at the thrift store.