The all new WordPress for BlackBerry app allows you to write posts, upload photos and videos, edit pages, and manage comments. Both WordPress.com and self-hosted WordPress (2.7 or higher) sites are supported. Download the app and start blogging on the go in no time.

The Blackberry app will work with all new BlackBerry devices such as the 8700, Pearl, Curve, Bold, and Storm, with BlackBerry OS 4.2.1 or newer.

Ps for some of you it might not work straight away when you set it up.

This is what I had to do  for my blackberry curve.

I had to go to my settings area of my WordPress dashboard. Under remomte publishing make sure that you check and Enable the WordPress, Moveable Tye, MetaWeblog and Blogger XML-RPC publishing protocols. Then save changes. 

On your Blackberry WordPress settings make sure that your Wap connection is also ticked.