Daylily - Some enter only books they own (whether read or not), some enter only books they've read (whether owned/borrowed/library), and others do a combination - all are acceptable, just a matter of personal preference. I enter all my library books and tag them as "@library" - it's useful to me to remember what I've checked out and what I thought about it. Also, it's the only way I could keep a "2006 reads" list since quite a few came from the library.