Tweetbot's been offering a rough-around-the-edges alpha version on its upcoming refresh for a few weeks now, but it's the latest update that's caught our attention -- again. There's several substantial changes that could tempt you away from other desktop Twitter clients. These include a new multiple account view, with separate columns that can either be docked to your main feed or left in their own window. You can spin out mentions and search results into their own space, and even adjust each column's height and width -- if you're looking to squeeze even more Twitter content into a single screen. A new menu bar icon offers access to your multiple accounts, new tweets, direct messages and mentions, while the latest build also improves support for media upload and Mountain Lion's notification bar. Tweetbot's alpha is still free to try for now, but once the kinks are eventually worked out, expect to pay for the finished article.