I am addicted to LibraryThing. I haven't cataloged all my books yet, but I'm getting there. For a while, I was buying books just for the joy of entering them in my catalog! Okay ... I've gotten over that a bit. But I still tinkering with the tags that I've added.

They're based in Portland, Maine ... right next door. Too bad I'm not a database guru in need of a job, huh?