J1CK-Tweet: Twitter for BlackBerry smartphones, Beta 1
For BlackBerry OS 4.3 or higher (most modern BlackBerries)
English
Spanish
Basque
Italian
French
Portuguese
Finnish
German
Simplified Chinese
Traditional Chinese
Japanese
For BlackBerry OS 4.2
(it will complain about an "unsigned app", but it will work fine anyway)
English
Spanish
Basque
Italian
French
Portuguese
Finnish
German
Simplified Chinese
Traditional Chinese
Japanese
You can check your BlackBerry OS version looking at Options->About.