[kyteflyer]

another alternative, and one which I use on occasion, is to open the OPDS catalog that calibre has built in, which can be accessed in a browser via your calibre IP. In my case, its 192.168.1.3:8080. You can get yours by starting up the Content Server under "Connect/Share" and checking its IP there. Then, simply search for the book you want, tell your device to download, and open in iBooks.

Here's what the front end looks like, when I load it up in Safari on my ipad. I find this the easiest way to get books into readers which don't allow direct access to the Calibre Library