The official Twitter app for BlackBerry
has gotten a nice little bump today -- though you'll need to be a member of RIM's BlackBerry Beta Zone
to get it at this point, since it's not quite gold yet. The new version adds a bunch of "features users have been asking for" including support for geotagging tweets, new push notifications for mentions, threaded direct messages, integration with BlackBerry OS' Social Feeds functionality, support for gestures on touchscreen devices, and new languages (Polish and Czech, it seems). As long as you've got a data plan and a device with BlackBerry OS 4.5 or higher, you should be good to go.