Blaq was pretty much the first full Twitter client on the BlackBerry PlayBook, and in my opinion remains to be the best one available.  It updated earlier this morning to version 1.1 adding a bunch of new features.  Here’s the change log:

• Scroll to top by double tapping respective icon
• Show lock when account is protected
• Maximize Web view
• Delete tweet
• Pull-down Options Menu (non-functional)
• Search
• Trending topics
• Link hashtags to search
• Better support for non-english languages when displaying tweets
• Progress bar for image upload
• New reply icon
• In-app notification system
• Link @ mentions to profile card
• Lists
• Multi-account
• New search icon to toolbar

Blaq for BlackBerry PlayBook >>

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