Which are the ways and how is possible a wp site become an iphone, ipad, android and a blackberry application(not a wp mobile theme)?
WordPress is a set of PHP scripts running on a web server. So your application needs a web server, a data base and PHP. I don’t think this is possible on all of those platforms.
To build it you can use hookpress or the json api. You would need to built a stand alone app and then query wordpress for the info you want, using the above two plugins makes that a lot easier, in effect you turning wordpress into an API.
An update to this post since I comes up via the googles:
Java for WordPress xmlrpc.