A few years ago, I donated my 2000+ book library to the Hacker Dojo. On a recent visit, almost none of the books remained. It's all O'Reilly books now. I understand that librarians have to be ruthless, lest they be overwhelmed with books, and people have differing visions for what a library should be. But it was a reminder of the ephemerality of life. I hope they found good homes!