If you're looking for a way to manage your Wordpress blogs with your BlackBerry, ScreamingToaster's Wicked Wordpress for BlackBerry is a great option.
Check out this video introduction of Wicked Wordpress.
"Wicked WordPress App for BlackBerry is a professional grade blog editor for people who have their own blog(s). Wicked is designed for BlackBerry OS 4.6 devices and higher. Itís been optimized for the Bold, Javelin, Storm, and Tour.
You can use it to edit any number of WordPress 2.7.1 (or higher) blogs, such as the blogs hosted on wordpress.com."