By Chris Brandrick, GigaOM A new version of popular Twitter client Tweetie is finally here, launching today alongside Apple’s new Mac App Store. The updated application comes with a new, more official, name — Twitter for Mac. So, are the various changes to this highly popular application worth getting excited about? To get the new app, you’ll first need to ensure that your Mac is updated to OS X 10.6.6. Once you are all up to speed, with the new Mac App Store installed, you can go ahead and download the updated application for free. You can’t just update your existing version of Tweetie. When first launching the new Twitter for Mac application, it’s clear that this is no major UI overhaul. Using small but significant visual tweaks, Loren Brichter and the Twitter team have stayed true to what made the first Tweetie such a success: a simple and clean interface, lacking unnecessary distraction. The most obvious change is the modified sidebar, which now sports a sleek translucent black look, along with two new icons — offering access to your lists and profile information respectively. In Twitter for Mac, what was once a “New Tweet” button in Tweetie now offers up a menu of commonly used actions. These actions include tweeting, sending a direct message, navigating to a specific user, marking all tweets as read or accessing the application’s preferences. For advanced Twitter users, this is a welcome change, but having to click twice to compose a tweet may annoy some. Either way, customizable keyboard shortcuts are still here to please everyone.