Yeah, I could ditto this. 🙂 Had written something based on this plugin a few years ago and realized it’s very slow for building a large page full of books. Had some discussion on the open library mailing list. I think there’s a better API to use… might followup someday. :)… in the meantime caching would be really useful.
Update: just realized he’s using the new API now 🙂 Still caching would be good.
