Bookmarklet for the National Library of Singapore (failed)
The service supports any library website in which you can access the book's lookup page via a URL that also contains the ISBN of the book. So, naturally, I wanted to apply this to my local library system, the National Library of Singapore (catalogue), which uses the CARLweb system. Unfortunately, poking around for hours (well, all right, minutes), I couldn't find any magic way of accessing a book's lookup page via a URL that contains the ISBN of a book - even by looking up a book via ISBN. So it appears that CARLweb can't be supported by this application, which is a tragedy indeed. All I can do is to look the book up on something like the National University of Singapore's library catalogue, which doesn't do me much good, since they require membership for entry (something that I have a MAJOR ISSUE with). Sigh.