TL;DR: Is anyone still using library- and book-related APIs? If you could have an API to anything known to LibraryThing, what would you want? I'm revamping LibraryThing's APIs, and am interested in what the Code4Lib community is thinking about APIs and mashups today. Is anyone doing anything interesting, or is this an idea from the past? On the one hand, I remember the heady days of cool book APIs and library mashups. I contributed a chapter to Nicole Engard's book "Library Mashups." I want to be part of a supportive community of people doing cool things. Making new APIs for that is worth it to me. On the other, LibraryThing has had to shut down many of its free APIs because they saw almost no "good" use—just a lot of abusive scraping. I want to make cool APIs for library- and book-people doing interesting things with books. I don't want to help jerks with crappy or dangerous "free ebook" sites populate their data. Whatever we do, it has to have clear limits. So what's your feeling? Secondarily, if you had access to everything LibraryThing knows—twenty years of direct and implied user data about books, some 70m MARC records(1) and so forth—what would you want an API to? We sell some of what he have already, in services like Syndetics Unbound(2), and we aren't going to provide free APIs to a paid product, but there's a lot we can do for libraries without any commercial concerns. Best, Tim LibraryThing