I have already put
here the links to the new 2.1.1 beta version for the pro models (and for the IQ) - it is taking me ages to download it (and still have not finished), but in the meantime it appears that the most prominent feature is the new organization of the files - this is also available as a separate applications (just put it in the "applications" folder), which I tried and looks pretty amazing (jsut explore all the options by clicking on the "books" icon on the top right corner of your screen): it allows you to visualise your books in a number of ways, including "genre", which, as far as I can see, means the tags you put when transferring books via calibre. Really good stuff! Only complaint, there is a word in cyrillic appearing at the bottom of the screen which I was unable to decipher.
The application, called "explorer_t.app" can be downloaded
here, adn I think we've got ava1ar from the Russian forum to thank