When Tapbots finally released its highly-anticpated Tweetbot Twitter client on the Mac, the software was labeled as a free Alpha. This means that the developers are continuing to add major new features and bug fixes leading up to the official 1.0 release in the Mac App Store. In fact, users are warned before downloading that there could be major bugs, and all Alpha testers are encouraged to submit bug reports to Tapbots.
Over the weekend, the first update was released for the Tweetbot for Mac Alpha, and the update packs several new features and improvements.