Do you want can manage your WordPress blog from your Blackberry Mobile Phone. There is an app called Blackberry App for WordPress. This Blackberry App for WordPress is free and open source.
This App works with most recent BlackBerry devices starting with the 8700, Curve, Pearl, Bold, and Storm. BlackBerry Device Software (OS) Version 4.2.1 is the minimum required. It with WordPress.com and self-installed WordPress 2.5.1 or higher, and WordPress MU 2.6 or higher.
Point your BlackBerry browser to http://blackberry.wordpress.org/install, this will download the latest version of the app.