First announced at BlackBerry World and then released in the BlackBerry Beta Zone earlier this month, Twitter 2.0 is now officially available. The app will be rolling out to users via BlackBerry App World over the next 24 hours, so if you don't see it now keep checking back. In addition to an overhauled UI, Twitter 2.0 features a redesigned navigation bar, single search screen, new app header (for better external notifications) and more. Twitter is free to download and available for most devices. Hit the link below to download.