[kyteflyer]

I use Dropbox to store my books. Calibre on my computer, catalog (and books) stored in my Dropbox folder. This way, every time a new book is added, it is synced to dropbox right away. Then, to get at my books, I usually access Dropbox online, and download to my reading device (I've chosen iphone) as required. I used to want everything on my phone but now that I store my books in my Dropbox, I don't need to. I don't use Calibre companion, its not needed for how I store my stuff.

If you are really opposed to using a cloud based solution, the only path, I suspect, is Calibre/Companion. But AFAIK there are no automatic sync options available.

FYI I use Hyphen (epub only... I used Goodreader for PDF, should I need to read a pdf) as my reader and it uses dropbox to sync bookmarks etc. So I can read on any device which has Hyphen on it. I used to use Marvin in the same way but found bookmark sync unreliable. There's a free version which only allows one book at a time, it would give you an idea if it would suit. Its called Hyphen Lite. Marvin has a free version too, with similar restrictions. Other than that you might also want to look at Kybook and tiReader.