EasyBib is an online bibliography generator. I guess if you have to make bibliographies, it's a useful tool. I can't remember the last time I needed to (probably college). I'll be interested to see if these small web applications have a place, or if they will be relegated to novelties.
Also, when was the last time anyone cared what city a book was published in? Seems like it was only ever needed to find the publisher, but how long ago did books generally become published by well-known companies rather than individuals with print shops? I can't imagine needing to know the city of publication after 1850 or so, yet it remains ensconced in the bibliography standards, and now web applications are asking for that irrelevant factoid.