Let me guess: You’re having trouble justifying the idea of actually buying an app for a free service like Twitter? Well, get you’re wallet out — this one’s worth it. Name a Twitter feature or action, and the popular iPhone app Tweetie has got it. All the simple, regular functionality is there (tweets, retweets, replies, etc.), as well as more advanced features like multiple account management, automatic link-shortening through bit.ly and a landscape view for easier iPhone typing. The simple, clean interface means Tweetie is — most importantly — easy to use. If you’re feeling particularly enamored with Tweetie, check out the desktop app for Macs, which comes in a paid version and a free, ad-supported version, complete with all the features and eye-pleasing design you’ve come to expect.