BlackBerry’s official Twitter app  is available for download. as stated this should be the best client for the bb devices since its designed by RIM .

Download it directly from your device

Update:

I downloaded the app for testing. Looks amazing and easy to navigate within…

The app features completely replace the regular web access:

• Register or Log-in
• Follow others
• Search
• Read tweets
• Reply to others tweets, and get replies for yours
• Create lists
• Profile
• And many other features!

Screenshots:

Login screen

Profile Page – 1

Profile Page – 2

Latest tweet from Kwt News – which we follow!

A new tweet notification in BlackBerry messages – as well as a twitter icon

The overall experience of the application is really cool; keeps you up to date with the ones or websites you follow, and its free!