Soo are there only one version of the book or many?

soft covers pocket book / hard covers big one? I'd really prefer smaller scale to allow better reading while travelling etc...

How about the translated versions? Is there a list of possible language options? Just english? It would be interesting to see a finnish translated version and it might make some of the more scientific text easier to read but... oh well I guess I will be going for the english version first anyways.